Yantrana, the Soul Channeler

Vigilance, double strike
You may casts any spell from exile. If you cast
a instants or sorcery spell from exile, remove that
card from the game.
{g}{b}: You may exile a card from the top of your library and gain life to it's converted mana cost.
{2}{w}{u},{t}: Return up to two nonland permanent
from play to the hand, then exile him, and return
him to the battlefield transformed.