Ghostly Keybearer

Ghostly Keybearer is a Commander card — the door mechanic rewards the kind of slow, synergy-layered boards that multiplayer supports, and the repeatable attack trigger compounds nicely over a long game. In 60-card formats like Modern or Pioneer, the setup cost is too steep: you need doors in play, a creature that survives to attack, and enough time to cash in, which is a three-part ask competitive decks won't tolerate. Standard is the one non-Commander format where Ghostly Keybearer could see fringe play if doors become a critical mass archetype, but that window is rotation-dependent. Oathbreaker mirrors Commander's dynamics closely enough that the same synergy logic applies.