The Dominion Bracelet (EOE-239) - Edge of Eternities

Equipped creature gets +1/+1 and has "15, Exile The Dominion Bracelet: You control target opponent during their next turn. This ability costs x less to activate, where X is this creature's power. Activate only as a sorcery." (You see all cards that player could see and make all decisions for them.)

Equip 1