Ent Grove

When Ent Grove enters the battlefield, you
may search your library for a forest, put it
onto the battlefield tapped, then shuffle.
{g}{g}: Conjure a card named Dryad Arbor
into your hand.
{x}{g}: Put X +1/+1 counters on target land you
control. If it isn't a creature, it becomes one until
your next turn.