Demon's Pact

When a creature an opponent controls would die this turn as a result of being dealt damage, if it has no Pact tokens on it, they may choose to give it one Pact token. If they do, prevent all damage that would be dealt to it this turn.
Pact tokens cannot be removed by spells.
When a creature with a Pact token on it dies, return it to the battlefield under your control at the beginning
of the next end step. It is a black Zombie in addition to its other colors and creature types.