Treefolk Sprout

If Treefolk Sprout is in exile, Treefolk spells
you cast from your library cost {1} less to cast.
Whenever a forest enters the battlefield under your control, you may pay {g}. If you do, mature Treefolk Sprout. (To mature this creature, exile
it. If you do, search your library for a non-Young creature card that shares a creature type with it.
You may cast it by paying the difference in mana
costs between it and this creature. Then shuffle
your library.)