Teacup, Nature's Diviner

Whenever you cast a green spell, reveal the top
card of your library. If it's a land or creature card
with converted mana cost less than that spell,
put that card onto the battlefield. Otherwise you
may put that card on the bottom of your library.
Whenever you cast a white spell, you gain 1 life
for each creature you control.
"Death and destruction beware, for the song of life is a fierce one."