Jaakumo, Living Ultimatium

Reach
At the beginning of each opponent's upkeep that player may sacrifice a creature, if they don't,
choose one-
• That player discards their hand.
• That player loses 10 life and gets
a poison counter.
• That player mills 8 cards, then exile all cards
from that players graveyard. You gain life equal to
the number of creatures that player has.