Ankhor, Toxin Conniseur

Whenever an creature with a -1/-1 counter on it
dies under an opponent's control, return that
card to the battlefield under your control.
Whenever one or more -1/-1 counters are placed
on a creature, you may pay {u}. If you do, draw a
card.
{3}{r}, {t}: Put a -1/-1 counter on each other
creature on the battlefield.