Sadistic Improviser

Unleash
When Sadistic Improviser enters the battlefield, if it was unleashed, put a +1/+1 counter on target creature an opponent controls and gain control of it until end of turn. Untap that creature. It gains haste until end of turn. That creature can't block as long as it has a +1/+1 counter on it.
"I'm going to need a volunteer."