Onna-bugeisha Oni

Defender (This creature can't attack.)
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block
as long as it has a +1/+1 counter on it.)
If Onna-bugeisha Oni has one or more +1/+1
counters on it, it can attack as though it didn't
have defender.