Unlike Turntimber Symbiosis, Agadeem's Awakening is a modal double-faced card that seems to have far more potential.
It would be a great addition to Death's Shadow decks, which will appreciate both sides of this spell. The land side can bolt you for 3 damage, which works better than shocklands, and the spell side can bring Death's Shadow back from the graveyard.
Agadeem's Awakening is also obviously very good in commander and Mono Black standard lists. Out of the five mythic rare modal cards in Zendikar Rising, Agadeem's Awakening looks like a sure winner.