Aamir Khan is incredible utility value.
Not only is he providing you with draw at the start of a burst turn, he's helping you build your last hand before you deck out if you get him early. Stock your hand with interrupts, or stash a key expensive ally with a double resource. Bury a Tackle or a Concussive Blow. Minions being a problem? Relentless Assault to the bottom.
After about two dozen games with Kamala on expert, I think he's strong enough to hard mulligan for and justifies aggressive use of the Team Spirit ability to get him out as fast as possible.