Xathramar, Walking One

Creature spells you cast have Delve.
At the beginning of your upkeep, exile a
card from your hand at random.
Whenever a card is put into exile from anywhere,
put a blood counter on Xathramar, Walking One.
Pay 2 life, Remove X blood counters from Xathramar, Walking One: Put X -1/-1 counters
on target creature.