Affinity
Deterministic engine · every format

The only app you need to play Magic.

Build by synergy, track the game at the table, sharpen with the deck doctor — a clear reason behind every card.
New deck
Explore commanders
Build

The engine suggests as you go

Start from a commander or a strategy; the obscurity dial does the rest.
New deck →
Play

The whole table, one app

Life, commander damage, poison and counters for 2–6 players.
Start a game →
Progress

The deck doctor says what to cut

Win rates, missing roles, curve, combos — with the reasoning.
My decks →

What the engine reads

Color sources
R under-served
Frank-Karsten weighted sources, not a naive pie chart
Category / saturation
5 / 7 roles
ramp · draw · removal · wipes · recursion · protection · win-con
Proactive curve
peak mv 3
two lanes — what you tap out to advance vs. interaction you hold up
Synergy graph
2 clusters
force-directed map — clusters emerge as your engines

Explore by archetype

All commanders →
Noncreature MV3+
Cheap Noncreature
Spellslinger
Drain
Lifegain
Control
Artifacts
Artifact Count
Construct Tokens
Tokens
Treasure
Value Tokens
Ramp
Card Draw

Frequently asked questions

Affinity is a free deck builder that recommends cards by mechanical synergy and obscurity instead of popularity — so you build a deck that plays like yours, not a net-deck. It goes deepest in Commander (EDH), but you can build and play any format.
A deterministic scoring engine rates every card on synergy, role coverage, mana curve, color sources and novelty, then explains each pick in plain terms. There is no AI guessing — the same deck always scores the same way.
No. EDHREC ranks by how often a card is played; Affinity ranks by how well a card fits your commander’s mechanics, surfacing hidden gems a popularity list buries. A novelty dial slides from proven staples to deep cuts.
Deck doctor + power/bracket assessment, a goldfish simulator, combo detection, a color-source (Frank-Karsten) check, and a force-directed synergy graph of your deck.
Yes — Standard, Pioneer, Modern, Pauper, Legacy and Vintage all build, save and play-track at the table. Commander is where the synergy engine and build coach go deepest; every other format gets deck-building, legality checks, the analysis lenses that apply, and the game tracker.
Unofficial fan content — not affiliated with Wizards of the Coast. Card data & images via Scryfall.
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