The Crucible

At the beginning of your upkeep add a War Asset counter onto The Crucible. If you don’t control an artifact named “The Citadel“, The Crucible has no other abilities. Remove 10 War Asset counters from The Crucible and exile it: Choose one: Destroy-You and target player each lose the game Control-Until the end of the game you gain control of target player Synthesis-The game ends in a draw Refuse-You lose the game Perfect Destroy-Remove 15 War Asset counters from The Crucible: Exile all permanents your opponents control then you win the game, this ability cannot countered