Illrak Roviask, Dark Medium

Flying
whenever a nontoken creature enters the battlefield under your control, you may sacrifice
it. if you do, amass X where X is that creatures
power
{u}{b}{r}{t}, Remove half the +1/+1 counters from target army you control rounded up: create a
black 0/0 zombie army creature token with Y
+1/+1 counters on it where Y is the number of counters removed this way.