[edit 2] Learn to read, Leute! Many of you are quoting my words wrong. I don't disrespect this card in general. At the moment I saw it, I was aware, that this is even better than Azure Drake in any odd mage deck. In the first sentence I talked about aggro decks, where if you also include Frostbolt and Fireball you would ruin your odd-deck synergy and thus the draw effect won't trigger. That's why I referred to the cat as the aforementioned mech in those types of decks.
I said AGGRO. In that deck you want to run fireballs, frostbolts and other burn spells. They have an even cost.
Baku and Genn are purely control cards really.
Tempo and Aggro don't really work with the deck limitation. The only exception is maybe in some sort of Zoo Hunter or something.
I actually see ba,ku being played in face hunter, the 3 damage hero power looks VERY good, and the current lists of face hunter don't use too many year of the kraken cards, while having 2 copies or razormaw, and little 4 drops..
can be acomodated to run baku, and deal a lot of damage.