Arkveld, White Wraith

Ward—Sacrifice a legendary creature

Annihilator 2 (When this creature attacks, defending player sacrifices two creatures)

Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)

Rapacious Hunger - Whenever another creature dies, put a +1/+1 counter on Arkveld.