Oathpact

When Oathpact enters the battlefield, choose
up to 10 target creatures you control and a
target opponent. While that opponent has
more than 0 health and this card is on the battlefield, those target creatures have vigilance and "{1}: return this card from the graveyard." If the target opponent drops to 0 health, exile Oathpact and all the creatures targeted by Oathpact.