Harriet Tubman

+1: If your opponent controls a slave card, then they must roll a d6. If they roll a 1, they must move one of their slaves to the graveyard.
-2: If your opponent controls a slave card, they must roll a d6. If they roll a 3 or lower, they must move one of their slaves to the graveyard.
-15: If your opponent controls a slave card, they must move half of their slave cards to their library, rounding up.