Peter, Warden of the Fey Curse

When Peter, Warden of the Fey Curse enters the battlefield, you may put a forest counter on target permanent.
(As long as a permanent has a forest coutner on it,
it loses all other abilities and card types and becomes a
basic Forest.)
Forestwalk, Reach

Bind the Fey Curse, he did / And in his prison, we live - The Epic of the Warden