Corvus Glaive

Double strike, riot (This creature enters the battlefield with your choice of a +1/+1 counter or
haste.)
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its
owner's control with a -1/-1 counter on it.)
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its
owner's control with a +1/+1 counter on it.)