Untouched Forest

Untouched Forest enters the battlefield tapped
At the beginning of your upkeep put X mystery counters on Untouched Forest where X is the
number of cards you own in exile.
{3}{g}{g}, Sacrifice this land: You gain X life where
X is twice the number of mystery counters on Untouched Forest. Search your library for a forest
and put it onto the battlefield tapped.
{t}: Add {g}.