MTG collection MCP server: your cards in any assistant
Reliquary is an MCP server for your Magic: The Gathering collection: add https://reliquary.gg/mcp to an assistant that supports MCP, sign in, and it can read and change your cards, decks and places with Reliquary's tools.
What MCP is
The Model Context Protocol is an open-source standard for connecting AI applications to outside systems. Its site names Claude, ChatGPT, Visual Studio Code and Cursor among the applications that support it. Reliquary is one such outside system: a remote server, reached over HTTP, that signs you in with OAuth.
What the tools cover
| Ask | Tools behind it |
|---|---|
| Where is a card? | where_is, show_card_location |
| What does this list cost me? | import_deck, claim_from_collection, whats_missing, generate_buylist |
| What can I build tonight? | what_can_i_build, show_buildable_decks |
| Can I trade with this player? | match_wantlist, match_tradelist, propose_swap |
| Bring in a collection | import_batch, fix_unresolved |
| Take everything out | export_collection, export_deck |
Each tool tells the assistant whether it only reads, adds, or changes and removes, so the assistant can ask you before a change. Deleting a deck, removing a stack and releasing all of a deck's claims only describe what they would do until you confirm.
What the assistant is told
Every connection starts with the same instructions: say which decks share a copy and where it physically is, name every proxy and never count one as a real card, say what a tool left out, and never invent a card, a count, a price or a place.
Questions
Which assistants work?
Any that can add a remote MCP server with OAuth sign-in. Connect your assistant has the steps for Claude, ChatGPT, Cursor and Claude Code, and the address for the rest.
Does the assistant see other players' collections?
No. A connection acts for the one player who signed in. Another player's cards are reached only through a list they published.
Can I end a connection?
Yes. Disconnect it on your account's Assistant page and it stops on its next call.
Are the assistant's calls part of a paid plan?
No. Calls are never sold; the plans differ in decks and a few features, on pricing.
Sources
- Model Context Protocol, What is the Model Context Protocol (MCP)?, read November 9, 2026