What it does
"Check Map" isn't an official Magic: The Gathering keyword or ability—it doesn't appear in the comprehensive rules or on any card. You may be thinking of a different term, or it could be slang from a specific playgroup or a misremembered mechanic.
If you're looking for actual map-related content, The Adventures in the Forgotten Realms set introduced the "Venture into the dungeon" mechanic, where you progress through dungeon cards (like the Lost Mine of Phandelver) to gain effects. Some players informally say "check the map" when reviewing their dungeon position to plan their next room.
If you meant a real keyword—like Surveil, Explore, Scry, or Venture—let me know and I'll give you a proper rundown of how it works and why it matters in Commander.
Iconic cards with Check Map
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