Mage of Trees

Whenever a creature you control retreats, create a
2/2 green tree creature token with defender.
Each player can't cast more than one spell each
turn.
Retreat {g}{g}. (When this creature deals combat
damage, you may pay {g}{g}. When you do, return
this creature to its owner's hand.)
Many keep the wilds ready the return of Tao Oko.