1. Define What the Deck Is Trying to Do
Start with the idea, then choose the format or commander that supports it. A Commander deck built around graveyard value needs a different structure from a spellslinger list or a combat-focused counters deck. Write the primary plan in one sentence. If that sentence is unclear, card selection usually becomes unfocused.
Next, identify the core cards: the pieces that enable the strategy, reward it, or convert it into a win. Do not fill every slot with synergy yet. Leave room for the fundamentals.
2. Build the Functional Skeleton
Construct the mana base around the deck’s actual color requirements and curve, not a generic land count copied from another list. Then add ramp where appropriate, interaction that answers the threats your deck is likely to face, and enough card draw or card advantage to keep playing after the opening hand is gone.
Choose win conditions that connect to the main strategy. A deck is easier to tune when its finishers use resources the deck already creates rather than asking for an unrelated setup.
3. Make Version One Playable
Fill the remaining slots and treat the result as a first draft. Check the mana curve, color distribution, number of expensive spells, removal coverage, and the balance between setup cards and payoffs. Goldfishing can expose obvious mana or sequencing problems, but it cannot replace games against interaction.
At this stage, some players build and buy MTG proxies as part of a test-first workflow, using clearly identified test cards in casual settings to evaluate uncertain choices before purchasing expensive originals. Always follow the rules of the playgroup, store, league, or event; proxies are not automatically permitted in sanctioned play.
4. Playtest, Diagnose, Revise
During games, watch for patterns rather than one dramatic result. A card that is bad once may simply have been drawn at the wrong time. A card that repeatedly sits dead in hand is a stronger signal.
Track practical questions. Are opening hands keepable? Does the deck make its land drops? Is there enough early interaction? Does card advantage arrive before resources run out? Can the deck close a game after establishing its engine?
Change a manageable number of cards between tests. Replacing too many at once hides the reason performance changed.
5. Lock the List Only When It Earns It
After several revisions, remove cards that are redundant, too narrow, too expensive for their effect, or disconnected from the plan. Recheck the mana base whenever the curve or color requirements change.
The final list is simply the version that currently meets the deck’s goals and budget. It can change again as the metagame, collection, or playgroup changes.
Conclusion
Good deck building is iterative. Concept, structure, first draft, testing, diagnosis, and revision matter more than getting all 100 Commander cards right immediately. Build a functional first version, learn from real games, and let each change solve a problem you can actually identify.
