As for me.
As for the aether vials, I may have cut some creatures for it, but I am positive that it won me more games than if I didn't have them at all. I actually find it hard to play survival without vials. Survival is soo mana intensive that I'd always want something to help me with mana.
As for the 3rd color, I think brainstorm is nuts. This deck needs that extra dig sometimes.Rhox warmonk is soo much better than finks, as its far out of burn range and stops aggro cold. But mana base can be an issue. I guess this will be meta dependent and player dependent.
If I were to go the vengevine route, I would try to put in the iona retainers combo still. Its power is just underestimated. Vengevine is strong but I still think Iona shuts down so many things that I wouldn't want her out. Maybe its metagame dependent as well. If there was a way to put both in one mix, I would probably do so

