Selfless Spirit ;this is more of a 'what' than an 'if' - mb wrath protection, flying blockers, flying to break the mirror - it does it all
Duskwatch Recruiter ;similar to above - just a 2 drop with a fantastic amount of power - being able to recruit a lot seems pretty powerful. I'm concerned about the relatively low creature density and the fact that the flip side is usually quite poor.
Collective Effort ;this effect seems quite powerful, but I'm usually not in a position to spend my creatures this way.
Aerial Responder ;this is a great answer to flying threats not named smugglers copter (read: spirits). Because of this unfortunate weakness, he'll be on the bench week 1, but if spirits are ever big, he'll probably come out.
Blossoming Defense ;Ormendahl is kinda insane in the meta right now - off the top of my head, only Blessed Alliance, Declaration in Stone, Stasis Snare, and Anguished Unmaking really stop it. While that may seem like a lot, they're all white, so the card is kind of insane outside of those matches. However, this allows me to continue to ride the Ormendahl train EVEN when I'm against white decks, as it is basically a counterspell. It also has applications in stopping kill spells at other guys and maybe as a bad giant growth, though I'm less sold on those as a feature
Brisela, Voice of Nightmares ;sure, this is actually two cards, but there's little reason to run one without the other. This fearsome combination gives an insane amount of inevitability except against exile-based removal (read: an unfortunate number of decks). This weakness is why it's not in the 75 right now, but if GB Delirium and Temur Emerge shove out white-based control, this card could be a hell of an answer to the inevitability provided by Emrakul.