I'm going to have to veto this.
Gaining card advantage (even temporary) is too much for a 'free' spell. I can't see this being balanced unless it only impulses one card, a-la Manamorphose.
You're begging to break Storm even more than it already it with this.
Sorcery U
Exile the top two cards of your library. You may play those cards this turn. Add RRRR to your mana pool.
More for the "cast lots of spells in a single turn" draft archetype.
Thoughts?
Gaining card advantage (even temporary) is too much for a 'free' spell. I can't see this being balanced unless it only impulses one card, a-la Manamorphose.
You're begging to break Storm even more than it already it with this.
Custom Card / Set Reviewer
When reviewing custom cards / sets, I look for (a) flavour, (b) function, and (c) cohesiveness, generally through a risk focus.