Is {Hangarback Walker} a bad option for affinity? He combos well with {Arcbound Ravager} and {Steel Overseer}
Two words.
Too slow. You're generally vomiting out your hand and simply don't have time to tick it up. And if it gets path'd ({Path to Exile}) it's extra bad.
However I think it's worth testing if you feel like it's good enough.
That's what I was thinking, it was tossed my way as an option and wasn't sure of it myself.