Turns out one of the visions seen int he set is that Duskmourn will have delirium as one of its mechanics. Look to see if your deck can support that before considering this.
With brainsurge, it is not even hard to setup 4 cards to get one free spell. Just have to make one be fan favorite emrakul, the aeons torn. Turn 5 Emrakul. Maybe this could be added to the typical RB through the breach-like deck in modern. Putting emmy on top your deck protects it and you actually get the cast trigger. Same CMC.
Source: LaughingDragon