Cleave (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
Draw three cards. [Your maximum hand size is reduced by three for the rest of the game.]
Me and my playgroup think this looks pretty good. Secrets of the Golden City saw a decent amount of standard play, so the precedent of 3 mana draw 3 is powerful enough to risk it being a Compulsive Research sometimes. This only works in decks that can dump their hands a little faster, but our card comp for this has been a souped-up Chart a Course. This is certainly playable in reanimator, agressive strategies, and a variety of combo decks that just want more card draw. It's splashable, digs deep, can enable discard, is a lethal topdeck, and even has the cleave cost if need be.
This is really interesting. It is less good than a compulsive research for pure control I think but if you support storm, reanimator, or even just spell slinger it becomes really interesting. A pure draw 3 for 3 is really good. I think I'm going to test it but have no idea how it is going to perform.