Brainstorm is one of the best draw spells in the game, especially if you have access to ways to shuffle your library, like fetch lands
There are a slew of new mechanics releasing with Tarkir: Dragonstorm
Having both ramp and card draw really adds to the playability of your deck, and they seem to complement each other, as seen in the graph below
3, T, Sacrifice a creature: Reveal a number of cards from the top of your library equal to the sacrificed creature's power
Each of these represent solid win conditions in their own right, either because of the amount of counters they can stack or because of how much damage they can deal once they have counters stacked on them
Overall it is too slow, gold and unreliable to merit inclusion in the main cube but it is a cute card