Wynona, the Beaver Keeper

Whenever Wynona, the Beaver Keeper enters
the battlefield, create a legendary green and red
beast creature token named Wynona's Big
Brown Beaver that has haste, trample, and
"when this creature attacks with one or more
creatures, put a +1/+1 counter on each creature
you control".
Whenever another creature is blocked by a
creature you control, put a +1/+1 counter on
each creature you control.