A .NET global tool that wires MCP clients into the Magic: The Gathering deckbuilding ecosystem. You get Scryfall card search and rulings, local deck workspaces with edit plans and validation, Moxfield imports that preserve boards and tags, Archidekt writeback with checkpoint management, Playgroup.gg meta analysis and power rankings, Commander Spellbook combo detection, and goldfish simulation with board state projection. Ships with three operation modes: read-only for lookup, plan for staged edits, and apply for writeback. Credentials live in separate JSON files. Useful when you want an LLM to suggest swaps under budget, analyze mana curves, find combos in your 99, or rank playgroup decks by win rate without switching between browser tabs.