Whenever you tap a Forest for mana, add an additional {G}.
+1: Put three +1 +1 counters on up to one target noncreature land you control. Untap it. It becomes a 0 0 Elemental creature with vigilance and haste that s still a land.
−8: You get an emblem with Lands you control have indestructible. Search your library for any number of Forest cards, put them onto the battlefield tapped, then shuffle.