MTG Salvation

It's 1 mana more and never a dead card as it can replace itself for just 1. I would say this card is likely better than Diabolic.. and Diabolic was a crappy card anyway that I would never run.. this card I could see, although I still think it's average.

I would run this as a diabolic tutor in my cycling deck,

At the cost of Demonic Collusion, cycling might seem to be kind of a strange thing to bump this up to five mana. At least the cycling cost is low.