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AI MTG Deck Builder

Name: MTG Agents
Author: MTG Agents

Describe a deck in plain English and get a complete, legal decklist back

MTG Agents is a free AI-powered deck builder for Magic: The Gathering. Say what you want to build - a commander, a strategy, a color combination, a budget - and get a complete, optimized decklist with a tuned mana base, real synergies, and card suggestions drawn from live card data. Works for Commander/EDH, Standard, Modern, Pioneer, and every other format.

Start Building Read the deck building guide

What the Deck Builder Can Do

AI-powered deck building tools backed by real card data from Scryfall

Build a Deck from Scratch

Name a commander or a strategy and get a full 100-card decklist back. Add a theme, a power level, or a budget and every card choice is tailored to it.

Analyze Your Existing Deck

Already have a deck? Our dedicated MTG Deck Analyzer reviews your list for cuts, additions, curve fixes, and synergy gaps - click to optimize the deck you already play.

Find Card Synergies

Discover combos and synergies you might have missed. The search runs across 40,000+ cards to find interactions that fit your commander and your game plan.

Optimize Your Mana Base

Get land recommendations based on your color distribution and mana curve - the right land count, the right colour sources, and the utility lands worth a slot.

Format-Aware Suggestions

Rules and card pools for Commander, Standard, Modern, Pioneer, Pauper, and more are all in scope. Every suggestion is legal in the format you picked.

Real Card Data

Powered by Scryfall with 40,000+ real Magic cards. No hallucinated or made-up cards - every recommendation is a real, playable card with accurate rules text and pricing.

Checked, not guessed

Every card clears a deterministic legality gate before it can be proposed

Every card is checked against the deck's format before it can be proposed. Not by the language model deciding a card looks right — by deterministic code that runs first, on the real card, against the format's rules. A card that would break them never reaches you as a proposal.

And nothing is written to your deck by an agent. Every add, every removal and every rename arrives as a proposal you accept or decline.

Format legality
The ban list
Color identity
Copy limits

How the whole system fits together is on How It Works.

How It Works

From idea to optimized decklist in minutes

Describe Your Deck

Say what you want to build. A commander name, a strategy like "aristocrats" or "spellslinger," a color combination, a budget - whatever you have in mind. The more specific, the better the results.

The Deck Builder Builds It

Carl, the deck-building agent, searches real card databases, finds synergies across thousands of cards, and assembles a complete decklist with proper ratios for lands, ramp, card draw, removal, and win conditions. Carl is the same AI deck builder that used to answer to Karn — new name, same agent.

Refine Together

Keep the chat going to swap cards, adjust ratios, and fine-tune the list. Ask for more card draw, a lower mana curve, budget alternatives, or a different win condition, and the deck updates in real time.

Why Build Decks with AI?

How this compares to browsing a stats site or building by hand

Faster

Get a complete, playable deck in minutes instead of hours browsing card databases and popularity lists. The research happens for you, so you can get to playing.

Smarter

AI finds non-obvious synergies across 40,000+ cards that manual searches miss - cards that work together in ways a popularity ranking will never surface.

Personalized

Builds to your budget, power level, and play style - not generic "most popular" lists. Every deck is tailored to what you actually want to play.

Interactive

Refine through conversation. "Make it more aggressive," "add more card draw," "swap expensive cards for budget options" - plain English in, an updated list out.

Supported Formats

Decks for every way to play Magic

Commander / EDH

Full 100-card singleton decks with commander selection, optimized mana bases, and synergy-driven card choices. By far the most common use - see the dedicated AI Commander Deck Builder.

Standard

Meta-aware builds using currently legal sets, with competitive and budget options for the current Standard environment.

Modern

Competitive and budget builds for Modern, covering the format's staples, common archetypes, and sideboard strategies.

Pioneer

Format staples and synergy-based builds for Pioneer, from aggro through to control.

Pauper

Commons-only optimization - the best budget-friendly builds using nothing above common rarity.

Other Formats

Legacy, Vintage, Oathbreaker, Brawl, and more. Name the format and any card-pool restrictions and the build stays inside them.

Build From Your Collection

Already own a pile of cards? Build using only what you have

Use Only Cards You Own

Paste a list of your cards and it becomes the whole pool - no card enters the deck that isn't already in your collection, so the build costs $0 in new purchases. Save your cards in our MTG Collection Tracker and lock a deck to them - click to see how.

Find the Deck in Your Pile

Not sure what to build? Ask "what can I build with these?" and your owned cards are scanned for the strongest commander, color combination, and archetype the collection actually supports.

Respects Your Copies

Say you own one Sol Ring and two Llanowar Elves and those counts are honored - an auto deck builder that works from your real collection, not a wishlist.

Frequently Asked Questions

Is the AI deck builder free?

Yes, MTG Agents is free to use. Create an account to save your decks, track changes, and come back to refine them later. No credit card required.

What formats does the AI deck builder support?

Commander/EDH, Standard, Modern, Pioneer, Pauper, Legacy, Vintage, Oathbreaker, Brawl, and custom formats are all supported. Name your format and any house rules, and the build stays inside them.

Does the AI use real cards?

Yes. The deck builder is powered by Scryfall, a comprehensive database of 40,000+ real Magic: The Gathering cards. Every card suggestion is a real, tournament-legal card with accurate rules text, mana cost, and pricing data.

Can I upload my existing deck for analysis?

Yes. Paste or upload your decklist and you get suggested improvements. For a focused diagnosis with cuts, adds, curve fixes, and an upgrade path, use our dedicated MTG Deck Analyzer.

Can the AI build a deck from cards I already own?

Yes. Paste the cards in your collection and the deck is built using only those cards - a $0 build from what you have. Ask "what can I build with these?" to see your best options, or jump to building from your collection.

How is this different from EDHRec?

A stats site shows you what cards are popular. This actively builds and refines a deck through conversation - finding synergies specific to your card choices, not just what is statistically common. One is a reference book; this is a deck building partner.

Can I set a budget for my deck?

Yes. Give a total budget or a per-card price limit and the suggestions stay inside it. You can also ask for the expensive cards in an existing deck to be swapped for budget alternatives.

Learn More

Explore our guides and tips to get the most out of AI deck building

Commander Deck Building Guide

Learn the fundamentals of building a Commander deck - card ratios, mana curves, and common mistakes to avoid. Read the guide.

Tips for Better Deck Building Results

Three strategies to dramatically improve what the AI gives you back - from adding context to being specific. Read the blog post.

Start Building Your Deck

Say what you want to build and get a complete, format-legal decklist in minutes

Build a Deck

Free to use - No credit card required - Save your decks

Explore More

AI Commander Deck Builder

Build a full 100-card EDH deck — commander selection, color identity, and power level.

MTG Deck Analyzer

Already have a deck? Paste it for cuts, adds, curve fixes, and an upgrade path.

AI Card Search

Looking for one specific card? Describe what it should do and get the cards that fit your deck.

Last updated: October 15, 2026