Mister Feelgood

Haste
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.)
Whenever a creature you control without a
+1/+1 counter on it attacks, you may put a
+1/+1 counter on it.
Partners with Walnut of the Eastern Grove