mtg-agents
AI MTG Deck Builder
Build better decks with Karn, your AI deck building assistant
MTG Agents is a free AI-powered deck builder for Magic: The Gathering. Tell Karn what kind of deck you want to build - a commander, a strategy, a color combination - and get a complete, optimized decklist with mana base, synergies, and card suggestions drawn from real player data. Works for Commander/EDH, Standard, Modern, Pioneer, and all formats.
What Karn Can Do
AI-powered deck building tools backed by real card data from Scryfall
Build a Deck from Scratch
Tell Karn your commander or strategy and get a full 100-card decklist. Specify a theme, power level, or budget and Karn tailors every card choice to your goals.
Analyze Your Existing Deck
Upload or paste a decklist and get suggestions for cuts, additions, and synergies. Karn identifies weak spots, missing staples, and cards that don't fit your strategy.
Find Card Synergies
Discover combos and synergies you might have missed. Karn searches across 40,000+ cards to find interactions that work with your commander and game plan.
Optimize Your Mana Base
Get land recommendations based on your color distribution and mana curve. Karn suggests the right number of lands, color sources, and utility lands for your deck.
Format-Aware Suggestions
Karn knows the rules and card pools for Commander, Standard, Modern, Pioneer, Pauper, and more. Every suggestion is legal in your chosen format.
Real Card Data
Powered by Scryfall with 40,000+ real Magic cards. Karn never suggests hallucinated or made-up cards - every recommendation is a real, playable card with accurate data.
How It Works
From idea to optimized decklist in minutes
Describe Your Deck
Tell Karn 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.
Karn Builds It
Karn 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.
Refine Together
Chat with Karn to swap cards, adjust ratios, and fine-tune your deck. Ask for more card draw, a lower mana curve, budget alternatives, or a different win condition - Karn adapts in real time.
Why Build Decks with AI?
How Karn compares to browsing EDHRec or building manually
Faster
Get a complete, playable deck in minutes instead of hours browsing card databases and popularity lists. Karn does the research so you can focus on playing.
Smarter
AI finds non-obvious synergies across 40,000+ cards that manual searches miss. Karn connects cards that work together in ways you might not expect.
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" - Karn understands natural language and adapts.
Supported Formats
Karn builds decks for every way to play Magic
Commander / EDH
Full 100-card singleton decks with commander selection, optimized mana bases, format staples, and synergy-driven card choices. The most popular way to use Karn.
Standard
Meta-aware builds using currently legal sets. Karn suggests competitive and budget options for the current Standard environment.
Modern
Competitive and budget builds for Modern. Karn knows the format's staples, common archetypes, and sideboard strategies.
Pioneer
Format staples and synergy-based builds for Pioneer. From aggro to control, Karn covers the full range of competitive strategies.
Pauper
Commons-only optimization. Karn finds the best budget-friendly builds using only common-rarity cards.
Other Formats
Legacy, Vintage, Oathbreaker, Brawl, and more. Tell Karn the format and card pool restrictions and he'll build within those constraints.
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?
Karn supports Commander/EDH, Standard, Modern, Pioneer, Pauper, Legacy, Vintage, Oathbreaker, Brawl, and custom formats. Tell Karn your format and any house rules, and he'll build within those constraints.
Does the AI use real cards?
Yes. Karn 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 your decklist into the chat or upload it, and Karn will analyze your card choices, identify synergies, spot missing staples, and suggest specific improvements.
How is this different from EDHRec?
EDHRec shows you what cards are popular. Karn actively builds and refines decks through conversation - finding synergies specific to your card choices, not just what's statistically common. Think of EDHRec as a reference book and Karn as a deck building partner.
Can I set a budget for my deck?
Yes. Tell Karn your total budget or per-card price limit, and he'll suggest affordable alternatives. You can also ask him to replace expensive cards in an existing deck with budget options.
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 Results with Karn
Three strategies to dramatically improve your AI deck building results - from adding context to being specific. Read the blog post.
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