MTG Deckbuilder

Build decks from cards you already own.

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Build Magic decks using only the cards you already own — Commander, Pauper, Legacy & more.

Crew That’s a Crew feature — saved inventory, bins, and deck search for supporters.
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How scoring works
Grade
A through F. Quick read on structural deck quality, derived from the composite score below.
Composite
0–100 blend of synergy, curve fit, completeness, castability and wincon coverage. It determines the displayed grade and serves as the fallback quality objective; learned models may separately rank candidate decks.
Ranking
Learned models help order card choices and compare constraint-checked deck candidates. They do not invent cards or bypass the build rules.
Synergy %
Share of the deck's nonland cards that score ≥ 2 against the archetype's signals. Higher means more cards pull in the same direction.
Castability
Hypergeometric probability that each spell can be cast on-curve given your mana base.
01 / Collection & Format
Format
Loading formats...

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02 / Preferences
Play Style
Color Preferences
Archetype Preferences
The builder will scan your collection and pick the strongest archetypes automatically.
Only building decks for selected archetypes.
Lock specific cards (optional)
Commander
Searches valid commanders for this format. The build still checks that your collection owns the selected card.
Searching...
No commander match — why?
Required Card
Searches any legal card for the format. For v1 this lock is nonland-only, and the build fails fast if your collection does not own the selected printing.
Searching...
Constrained builds automatically cap the number of decks built so the builder spends its budget on fewer higher-quality results.
Advanced Parameters
Minimum Grade
(filters out weaker decks)
Power Bracket
Bracket 4–5 allows combo packages.
Include Foils
Min Deck Price ($)
Max Deck Price ($)
Max decks
Crew unlocks up to 20 →
Uses your card purchase prices as per-card values. Decks outside the selected range are excluded from results.
Languages (leave empty for all)
Card Condition (leave empty for all)
Set Filter (Crew)
Beam width (Crew)
Waiting for format options to finish loading.
Complete the security check above to enable Build Decks.
03 / Build Progress
R–
synergy score pinned
synergy score