Hastened Removal

If four or more permanents have left the battlefield this game, you may pay {0} rather than pay Hastened Removal's mana cost.
Destroy target creature. It can't be regenerated.
"Killing a man is easy, I've done it plenty of times. What's not easy is when you have to deal with his friends too... you start running out of patience."
- Jackal, Assassin Virtuoso