Yawgmoth's Desecrator

Swampwalk
When Yawgmoth's Desecrator enters the battlefield, it deals 5 damage to you.
Whenever Yawgmoth's Desecrator deals combat damage to an opponent, exile that player's graveyard. Until end of turn, you may cast spells exiled this way, and may spend mana as though it were mana of any colour to cast them.