Mech, Rattle and Roll Out (Mechrattle Hunter - Rise of Shadows)

Shimmerfly because it's a good dude to just get the value rolling, Ursatron to draw your other mechs, Animal Companion because Animal Companion, and Shaw is just too good to pass up. Any other choices are up to you.

In aggro you're just looking to survive, which means you want things able to remove stuff, get you more things, and do double-duty by rushing your deathrattles into active minions to get more stuff and kill other things.