Exemeros, King over Squirrels

Forestwalk, Protection from Squirrels
Exemeros's power and toughness are equal to the number of squirrels on the battlefield

Whenever a squirrel you control deals damage to a player, put a +1/+1 counter on every squirrel you control and you may put a squirrel from your graveyard or your hand onto the battlefield without paying its mana cost