If you want to brew without buying a playset of something that costs more than your car payment, you end up doing a MTG proxy deck testing workflow. The point is not to create museum-grade fakes. The point is to get a deck you can shuffle, play, tweak, and shuffle again, without turning the whole thing into a craft project you resent.
This is a practical path from “decklist exists” to “deck is sleeved and ready,” plus a testing loop that produces actual answers instead of vibes and one dramatic story about being mana screwed.
Start with a test goal (before you print 100 cards for no reason)
Proxies make iteration cheap, which is great right up until you change half the deck after one loss and learn nothing.
Pick one main question for version 1:
- Does the plan function in the first 4-5 turns?
- Is the mana base doing what it promised?
- Do i fold to a specific kind of interaction (countermagic, grave hate, fast aggro)?
- When i “do the thing,” do i actually win?
Write the question down. It keeps you from drifting.
For Commander, your test goal is usually about consistency: casting your commander on time, double-spelling without dying, rebuilding after wipes, and not spending three turns assembling a value engine that politely eats removal.
Decklist to proxies: choose the fastest method that fits your time horizon
Your decklist needs to export cleanly in plain text. Arena-style lists are common, but any consistent “quantity + card name” format works. The goal is copy, paste, and move on.
From there, pick a proxy method based on how long you plan to test this deck.
Option 1: Paper-in-sleeve proxies (fastest, least precious)
Print on normal paper, cut, and sleeve in front of a basic land or bulk common. It’s cheap, fast, and totally fine for testing.
To keep it playable, prioritize readability:
- Card name and mana cost must be easy to see.
- Creature power/toughness should be visible.
- If the card is weird, include a short rules summary.
This is the “tonight” option.
Option 2: Nicer home proxies (still fast, slightly less ugly)
Full card images look better and reduce “what does this do again?” pauses. But be careful: realism can eat your time. If you expect heavy iteration, print nice versions for the core engine and do simpler text proxies for the slots you’re likely to swap.
Option 3: Outsourced printing (when you want to stop owning a paper trimmer)
If you plan to play the deck for weeks, outsourcing can be the least suffering. You still need a solid list and a way to track changes, but you skip the whole “cutting 100 rectangles” phase.
If you want a quick primer on what proxies are and where they fit socially, our guide All About MTG Proxy Cards covers the basics and the usual etiquette landmines.
No matter which option you pick, label your list as V1, V2, V3. Put the version number in your notes and on your printout. You think you’ll remember. You won’t.
Printing and cutting (the part where your printer tries to gaslight you)
Two common proxy failures:
- The size is off.
- The cards are technically printed, but functionally unreadable.
A Magic card is about 63mm x 88mm (2.5″ x 3.5″). Your proxies should match closely so the deck shuffles evenly.
Do a single test page and measure one card before printing a stack. Watch for printer settings like “Fit to page” or “Scale to printable area.” Those are perfect for school reports and absolute poison for proxy sizing.
Minimum readable elements at the table:
- Name
- Mana cost
- Type line
- Key rules text
Cutting: scissors work, but they’re slow. If you proxy often, a cheap paper trimmer is worth it. Cut rows first, then columns. Stack only as many sheets as your cutter handles cleanly.
One more time-saver: build a “staples stash.” Keep a small pile of evergreen cards you reuse constantly (lands, common ramp, generic removal). Reuse means fewer prints per iteration.
Sleeving and version control: keep your MTG proxy deck testing workflow stable
A deck isn’t ready when the cards are printed. It’s ready when the physical deck behaves consistently.
Use one sleeve type for the whole deck. If you’re sleeving paper proxies in front of real cards, use the same kind of backing card for every proxy. Mixing thickness is how you accidentally make marked cards and then “testing” becomes “guessing.”
Label the deck box with deck name, version number, format, and the date you sleeved it. Inside the box, keep a single note card with your test goal and a short list of “cards to watch.” Small step, big payoff.
Also pack the stuff that makes your deck function: tokens, dice, and any mechanic reminders you need (poison, energy, experience, whatever). The goal is fewer pauses where everyone waits while you look up your own cards.
A testing loop that gives answers (not just vibes)
Now you need structure. Not rigid laboratory structure. Just enough to keep you from rewriting the list every time you lose.
1) Goldfish with intent
Run 8-10 opening hands. For each, note:
- Keep or mulligan?
- Did you advance your plan by turn 3-4?
- Did your mana cooperate?
If you consistently mulligan into misery, don’t call it bad luck. The list is telling you something.
2) Focused games against a known deck
Pick one benchmark deck and play a small set of games against it (even 4-6 is useful). Then change one small thing and repeat.
Small means swap 2-3 cards, adjust 2-3 lands, or add redundancy for one engine piece. Do not change fifteen cards at once. That’s not iteration. That’s a reboot.
3) Real games, real tables
Once the deck survives controlled testing, bring it to real games. Track patterns, not anecdotes:
- Are you always behind early?
- Do you run out of gas?
- Do you lose to the same type of disruption?
After each session, write a short changelog: what felt bad, what felt great, and what you’re changing next. That changelog is the backbone of an MTG proxy deck testing workflow. It keeps you honest, and it stops you from re-adding the same pet card every other week like it’s a seasonal tradition.
Remote testing, because schedules are fake
If your group can’t meet in person, you can still get good reps. Webcam play (SpellTable is the big one) keeps the paper experience, and digital clients like Cockatrice or XMage let you import a decklist and jam games fast with less setup.
The trick is to pick one environment and stick with it long enough to get signal. Switching tools every session is how you test your patience instead of your deck.
Wrap up
A good proxy workflow is boring in the best way. Define the question, version the list, proxy it with the least pain possible, sleeve it consistently, and test in layers. If you do that, you’ll spend less time doing arts-and-crafts and more time learning whether the deck is actually good.
And if the deck is bad, you’ll find out with paper and ink instead of a cart full of singles and a sense of betrayal.
