Deadpool

Haste, First Strike
Undying (When this creature dies, if it
had no +1/+1 counters on it, return it to
the battlefield under it's owner's control
with a +1/+1 counter on it)
{5}{t} Target opponent gains control of
Deadpool. Deadpool does damage to that
player on their endstep equal to Deadpool's
power.