Manamancer is a web-based Magic: The Gathering deck-building workspace. It combines card search, deck construction, format checks, collection tools, public deck pages, playtesting, statistics, and an optional AI assistant in one place. The goal is simple: help a player understand why a list looks the way it does, not merely store 100 card names.
Last reviewed: August 2, 2026.
What Manamancer is built to do
A deck can move through several stages here. You can search the card index, build a list, choose its format, inspect construction warnings, study its curve and color demands, test opening hands, track the cards you own, and publish the result when you are ready to share it. Public deck and profile pages are visible without requiring an account so a shared link is useful to the person who receives it.
The app supports fourteen formats:
- Commander
- Standard, Pioneer, Modern, Legacy, Vintage, and Pauper
- Alchemy, Historic, and Timeless
- Standard Brawl and Brawl
- Pauper Commander
- Canadian Highlander
Those formats do not all use the same deck size, copy limits, sideboard rules, command-zone rules, or card pool. Manamancer keeps those differences in a dedicated format engine instead of treating every list like Commander. Our format-legality guide explains what the checks can and cannot tell you.
Card data first
Manamancer's searchable card index is built from Scryfall data. Search results, card details, images, format legality fields, and most displayed market estimates ultimately depend on that imported source. The server keeps a local index so deck search and validation can use one consistent snapshot instead of asking an AI model to remember the Magic card catalog.
That distinction matters. Magic has tens of thousands of cards, repeated printings, double-faced layouts, changing format legality, and exact Oracle wording. A confident-sounding answer is not a substitute for a card record. Manamancer therefore uses structured card data for ordinary search and for the final validation boundary around its AI suggestions.
Card and price data can still age between imports. A displayed price is an estimate, not an offer to sell, and a tournament organizer or the current official rules remain the final authority for an event. The footer links back to Scryfall and identifies Magic: The Gathering as Wizards of the Coast intellectual property.
An AI assistant with a narrow job
Manamancer's OpenAI-powered Agent is a Commander-only feature. The rest of the deck builder supports all fourteen formats, but the Agent and AI deck generation do not claim to advise on all fourteen. Keeping that scope explicit lets the product apply Commander legality and color-identity checks to concrete recommendations.
During an Agent run, the model searches Manamancer's local card index. A proposed addition must have appeared in that run's search results and must survive server-side validation before it can become a recommendation card in the interface. The validator rejects a proposal if the card is absent from the index, not Commander-legal, outside the deck's color identity, or otherwise conflicts with relevant deck constraints. A player still chooses whether to apply or dismiss each proposal.
This boundary prevents invented card names from becoming actionable recommendations; it does not make the model a rules judge or guarantee that every strategic opinion is good. The validated Commander Agent guide describes that distinction in detail.
Statistics are evidence, not a grade
The statistics view turns the current list into things a deck builder can inspect: mana-value distribution, colored mana symbols, card types, estimated value, opening-hand tools, and heuristic counts for common jobs such as ramp, draw, removal, and board wipes. Commander lists can also show Commander-specific estimates and Canadian Highlander lists can show their points total.
Some of those values are exact counts from the loaded card records. Others are heuristics based on Oracle text and card type. A card can perform a role in a way that a text pattern misses, and a flexible card can serve more than one role during play. We publish that limitation because a useful statistic should invite a closer look, not pretend to settle a deck-building decision. See how to read your deck statistics.
Who operates the service
Manamancer is operated as a sole proprietorship established in Québec, Canada. It is an independent, unofficial fan project and is not produced, endorsed, supported by, or affiliated with Wizards of the Coast or Scryfall.
The binding terms for using the service are in the Terms of Service, and the Privacy Policy explains what information is processed and the choices available to users. Those documents are available from every page footer.
For product support, privacy questions, public-content reports, copyright notices, or policy concerns, use the contact page or email support@manamancer.com.
