Mark of Neverest (Blue) [IAR066] (Usurp the Shadow Throne)

Binds to an ally permanent you control. (Attach this to an ally. Destroy this if the ally leaves the arena.) The bound ally gets +1POWER and "Whenever this hits a hero or dies, you may turn a card in your banished zone face-down. If you do, create a Corrupted Corpse in your banished zone."