The Old Forest

{t}: Add {g} to your mana pool.

{g},{t}: Exile target creature attacking you
with power 3 or less. It remains exiled as long
as you don´t untap The Old Forest. You may skip untapping The Old Forest in your next uptap phase.

Sacrifice The Old Forest: search your library
for Fangorn Forest, show it, and put it in
your hand. Shuffle your library.