TLDR
Use Commander sidegrade proxies to compare cards that perform the same basic job but offer different tradeoffs. Begin with a fixed 100-card baseline, define the outgoing card’s job in one sentence, and change only that slot. Record whether the replacement was castable, found useful targets, supported your commander, and remained relevant when drawn late. After representative games, keep it, revert, or retest it. Do not treat one spectacular play—or one game where it sat uselessly in hand—as a verdict.
The point of Commander sidegrade proxies is not to prove that Card B is universally better than Card A. It is to discover which version better suits this commander, this mana base, this power target, and the tables where you expect to play. Commander variance can turn a merely acceptable card into the hero of one game and hide your supposedly perfect replacement for the next three. Controlled testing gives that chaos fewer places to conceal bad conclusions.
What makes a card a sidegrade?
A sidegrade preserves a deck slot’s broad function while changing how that function is delivered. Two removal spells might differ in mana cost, timing, target range, restrictions, or what they give an opponent in return. Two draw engines might differ in setup time, resilience, commander synergy, and how useful they are from an empty hand. Neither comparison has to produce a universal winner.
That distinguishes a sidegrade from a straightforward upgrade or downgrade. If one option does everything the other does for less mana and with no meaningful drawback, the choice is probably not very interesting. Sidegrade testing matters when each card creates a defensible advantage under different conditions.
A useful comparison considers mana cost, timing, restrictions, available targets, synergy, and setup requirements rather than stopping at a broad label such as “ramp” or “draw.” MTG EDH’s singleton and card-comparison discussion provides a deeper strategy-oriented treatment of those factors.
Start with a fixed baseline list
Before swapping anything, save the current version of the deck. Give it a date or version number and confirm which 100 cards belong to it. Your baseline does not have to be perfect; it only needs to be stable enough that you know what changed.
Then change one main-deck slot. If you replace a draw spell, a land, two interaction pieces, and a finisher at the same time, a better game tells you almost nothing. The deck may have improved because of one change, several changes working together, an unusually strong opening hand, or an opponent who politely failed to interact with you for nine turns.
Keep the remaining 99 cards stable during the initial comparison. This is especially important when the proposed sidegrade affects the mana curve, colored-pip demands, permanent count, or density of cards your commander can copy, recur, reveal, or otherwise exploit.
For a broader process covering an entire untested list, use the complete Commander proxy playtesting workflow. Sidegrade testing is narrower: it assumes the deck already has a recognizable plan and you are resolving a specific flex-slot decision.
Define the slot’s actual job
Describe what the outgoing card does for this deck in one sentence. “It is removal” is usually too vague. Better definitions identify the game state you expect the card to solve.
- Protect the commander for one critical turn without leaving much mana unused.
- Remove a problematic permanent that this color combination otherwise struggles to answer.
- Turn excess creatures into cards after a board wipe becomes likely.
- Find an early land while remaining useful when drawn after the deck is established.
- Provide a sacrifice outlet that also advances the deck’s primary engine.
- End a stalled game without requiring several otherwise weak setup cards.
This sentence becomes the test. A replacement can be individually powerful and still fail if it does not perform the required job. Conversely, a less efficient card may be the better fit because your commander reduces its cost, your graveyard package can reuse it, or its permanent type matters to the deck.
Build a one-for-one comparison
Compare the existing card and its proposed replacement before playing. You are not trying to predict every result; you are identifying the situations worth watching.
| Factor | Question to ask during testing |
|---|---|
| Mana | Can the deck cast it on the turn when its effect normally matters? |
| Colored pips | Does it compete with the commander or other key spells for the same colors? |
| Timing | Can it be used at instant speed, or does it require committing during your turn? |
| Target range | Which common threats or game states can it address, and which can it not? |
| Setup | Does it need a creature, graveyard, artifact, token, or prior board presence? |
| Synergy | Can the commander or another central engine copy, recur, discount, or trigger from it? |
| Resilience | How easily can opponents disrupt it before it provides value? |
| Late-game value | Is it still useful when mana is plentiful and players have established boards? |
| Table fit | Does it create the pace and experience intended for this deck and pod? |
A card that costs more mana can absolutely be a sidegrade rather than a downgrade. The extra cost may buy broader targets, stronger synergy, greater resilience, or more value when games run long. The relevant question is whether those advantages arrive often enough to justify the added burden in your deck.
Run controlled tests without turning game night into a laboratory
Put the test proxy into the deck and keep the original card nearby but outside the shuffled 100. Mark the proxy subtly on the sleeve insert or keep a short version note so you can identify the tested slot without making it unreadable to opponents.
If you have three plausible replacements, test them sequentially rather than shuffling all three into different slots. A simple rotation works well: baseline card, Candidate A, Candidate B, then a return to the baseline if the result remains unclear. A small physical test package can be made with handwritten inserts, spare cards in opaque sleeves, or print-on-demand MTG proxies when you want durable, readable pieces for repeated games.
Play in the environment the finished deck is intended for. Testing a slow value engine only in unusually fast games may reject a perfectly reasonable card for your normal pod. Testing a narrow answer only against the matchup it punishes can create the opposite mistake. Seek representative tables, not favorable demonstrations.
There is no universal number of games that makes a sidegrade decision correct. Continue until you have seen the card in enough relevant situations to explain its strengths and weaknesses. If it never appears, that is not evidence for or against it; it is merely Commander reminding you that a 100-card deck has opinions about your schedule.
Record observations that can change the decision
You do not need a spreadsheet with seventeen tabs. A short note after each game is enough, provided it records what happened rather than how impressive the card felt.
- Was the card castable when you wanted its effect?
- Did colored mana prevent or delay it?
- Did it have a legal and worthwhile target?
- Was it stranded because its setup condition was missing?
- Could the baseline card have solved the same situation?
- Did your commander or another engine create additional value from it?
- Did recursion, copying, tutoring, or permanent-type synergy matter?
- Was it useful on curve, late in the game, or both?
- Did it advance the deck’s plan or merely generate generic value?
- Did the swap noticeably change the deck’s pace, threat profile, or table experience?
Separate card performance from game outcome. A replacement can do its job perfectly in a game you lose. It can also contribute almost nothing while the rest of the deck wins comfortably. “Won with Candidate A” is weak evidence. “Candidate A was cast on turn four, answered the intended permanent type, and left enough mana for the commander’s protection trigger” is actionable.
Distinguish a bad fit from ordinary variance
One weak showing deserves a note, not immediate exile to the maybeboard. Ask why the card failed. A situational card drawn without a legal target may have encountered normal variance. A card that repeatedly lacks targets in your usual pod may be mismatched to the environment. A spell that remains stuck in hand because the deck cannot produce its colored pips points toward a structural problem.
Retest when the observation was ambiguous, the game ended before the card could matter, or the pod was unlike the deck’s intended environment. Revert when the replacement repeatedly fails the job you defined. Keep it when its tradeoffs consistently suit the deck better, even if the original remains stronger in some isolated situations.
Once the remaining questions are marginal rather than structural, the decklist lock-in checklist can help you stop endlessly rotating the 100th card. There will always be another plausible option. At some point, the deck deserves to become a deck instead of a committee meeting.
Keep construction rules and card wording in view
The finalized Commander deck must contain exactly 100 cards including its commander, remain within the commander’s color identity, and generally avoid duplicate English card names other than basic lands and card-specific exceptions. Differently named cards may perform comparable functions, which is what makes sidegrade testing possible, but each candidate must still satisfy the deck’s construction constraints.
Check current wording before finalizing a choice, particularly when an interaction depends on targets, timing, card types, or a revised ability. Wizards provides official rules resources and identifies Gatherer as a reference for current card information and wording on its Magic rules page.
Keep experimental alternatives, tokens, emblems, and other helper pieces outside the final 100. When the list is settled, the Commander proxy order checklist covers count verification, helper pieces, double-faced cards, and readability before the deck becomes a finished physical project.
Treat proxy acceptance and power level as separate questions
A sidegrade does not automatically raise or lower a deck’s power. One replacement may improve efficiency, but another may simply broaden targets, reinforce a theme, or work better with the commander. Explain meaningful changes to your group when they alter speed, consistency, combo access, or the expected play experience.
Also tell the table that you are testing a proxy package. A brief explanation is enough: identify the card being tested, the card it replaces, and whether the experiment changes any important power expectation. The playgroup-fit guide for Commander proxy decks can help when the swap is part of a larger power-level adjustment.
Casual table acceptance does not establish store or event permission. Check the applicable organizer or venue policy before bringing proxies to organized play. Wizards Play Network maintains policy and rules-documentation resources for event settings.
Turn the result into a clean final deck
Finish each test with one of three decisions: keep, revert, or retest. Record one sentence explaining why. “Keep: easier to cast while holding up protection” is more useful than “felt better.” If you choose retest, state what remains unresolved so the next game has a purpose.
After selecting the winner, remove every experimental piece and audit the final list line by line. Confirm the card name and current wording, recount the deck, separate tokens and helper cards, and check that the chosen treatment remains legible across the table. If the rest of the deck uses a cohesive frame or visual theme, bring the winning sidegrade into that presentation only after the functional decision is settled.
The best sidegrade is the one that fits your deck’s real job
Start with one slot, define its job, and test one replacement while the other 99 cards stay fixed. Watch castability, targets, setup, synergy, late-game relevance, and table fit. Then make a documented keep, revert, or retest decision based on the deck you actually play—not on a universal ranking that ignores your commander and pod.
For deeper questions about efficiency thresholds, archetype-specific card selection, or competitive optimization, continue with specialist Commander strategy resources. For the physical project, your next step is simpler: settle the slot, clean the list, verify the final 100, and turn the tested version into a readable deck you can put on the table.