Gaea's Will

Conjure {g}(If 1 or more +1/+1 counters have been
put on a creature or a player has gained 1 or more
life this turn, this spell costs {g} less to cast.)
Search your library for a Forest card, put it onto
the battlefield tapped with a Bloom counter, and shuffle your library.
"If you are to closely examine what a tree has and the life a tree has...you can examine whole worlds."
- William Shatner