Decomposing Carcass

Whenever Decomposing Carcass deals combat
damage to a planeswalker, destroy that
planeswalker. If a planeswalker dealt damage by Decomposing Carcass would be put into a
graveyard, exile it instead.
Players can't cast spells with the same name as
cards exiled with Decomposing Carcass until Decomposing Carcass leaves the battlefield.