Magic: The Gathering Commander Deck Builder
Build, Import, and Tune Better Commander Decks
Build smarter MTG Commander decks from your collection, a decklist you found, or a deck you already play. Spellweave creates full 100-card decks, finds what's missing, and suggests the best swaps from your cards or all legal options.
Deck Anatomy
Every Slot Has a Purpose
The engine allocates specific role targets before picking a single card. Ramp, draw, removal, board wipes, protection. Each gets a calculated budget based on your commander and archetype, then the engine fills every slot from your collection.
The result: a deck that functions even when your synergy plan is disrupted. You always have answers, always have mana, always have cards in hand.
Binder to Battlefield
From Your Binder to a Focused Deck
Import your collection from ManaBox, Moxfield, Archidekt, or paste a card list. Also use Scryfall search queries to explore and import cards you don't have scanned yet. The engine scores every card for synergy and role fit, then constructs a balanced 100-card deck.
Your Collection
4,821
3,209 unique prints
266
Mythic
714
Rare
982
Uncommon
1247
Common
Your Deck
synergy
Why These Cards Made It
Every Card Earns Its Slot
No black-box recommendations. Every card in your deck has a tagged role and a reason it was selected over alternatives in your collection.
Recommended Cards
See What Your Deck Needs
Open any deck to get 15 ranked recommendations based on what the list is missing. Cards are scored by deck need, strategy fit, and commander synergy. Free for everyone.
Each card includes a price link to TCGPlayer and an explanation of why it fits. One click adds the full list to your TCGPlayer cart.
Strategy Breakdown
Learn How to Pilot Your Deck
Run AI analysis on any deck to get a strategic breakdown with key card references, sequencing advice, and matchup-aware guidance.
Power Level
Build for Any Power Level
Choose a target bracket and the engine respects game changer restrictions, adjusting card selection to match your playgroup's power level. Or skip brackets entirely for unrestricted optimization.
Casual theme decks. No game changers or infinite combos.
Precon-level power. No game changers or infinite combos.
Strong synergy. Up to 3 game changers. Two-card combos allowed.
High power. All cards and combos eligible.
Competitive. All combos, all cards, win as fast as possible.
30+ Archetypes. Your Collection. One Engine.
Aristocrats, spellslinger, tribal, voltron, group hug, stax, and more. The engine detects your commander's strategy and scores every card to match.
Learn to Build Better Decks
Guides covering mana bases, synergy, optimization, and more.
Commander Brackets
The official power-level framework for Commander. How brackets work, game changer cards, and choosing the right level for your group.
Read guide →Deck Optimization
How to upgrade a precon or tune an existing deck. Identifying weak slots, improving consistency, and upgrade paths.
Read guide →Choosing a Commander
How to pick the right commander for your playstyle. Color identity, build-around vs value engines, and partner mechanics.
Read guide →Commander Deck Building
The foundations of building a 100-card singleton deck. Card roles, the rule of eight, and how to balance your strategy.
Read guide →EDH Archetypes
From aristocrats to voltron. A breakdown of the most popular Commander archetypes and what makes each one tick.
Read guide →Mana Curve in Commander
Why mana curve matters in a 100-card format. How to distribute costs for consistent early, mid, and late game plays.
Read guide →Ready to Build?
Import your collection and discover the synergies you've been missing. Free to start, no credit card required.