This will definitely suffer from the fact that you have to draw the buffed minions first, and that's after a 3 mana "do-nothing right now" plus having 3 less mana than your opponent for possibly 9 turns.
One might argue that the +2/+2 remedies being behind on Mana, but if you figure 1 Mana = 1/1 worth of stats on average, then you're still behind, unless you play more than one minion a turn, but that calls for a lot of card draw. More than priest could muster unless they get good card draw from RR.
This card is absolutely terrible....right now. The problem is this card requires support for it to be good but if priests get that support, this card can be game changing. Now I personally doubt priests will get that support but if they do, they'll be really scary.
What's needed for this card to be playable is the ability to generate more mana crystals. Currently, only druids have that ability but then again, that's never stopped Blizzard before.
For instance, if a card like this existed...
<==== Not a real card.
Then it wouldn't be hard to imagine Surrender to Madness working out. So, in my eyes, there's a very very slight possibility this card may receive the support it requires to become viable or even powerful. Until then, don't kid yourself. The card is bad.
This is as bad a card as I've ever seen. +2/2 is equal to two mana, but each turn you're losing three mana. And it costs three mana to play with zero body. AND it's in a class with no early game. And you only get that in cards you draw.