Vaeril, Nature's Maestro

Whenever you cast a green spell, discover a creature (Reveal the top three cards of your library. You may put a creature card from among them in your hand. Put the rest on the bottom of your library in any order.)
Whenever you cast a blue spell, compose 2 (Create a colorless 2/2 Art creature token with haste. Sacrifice it at the beginning of the next end step.)
"The nature has music for those who listen."