Originally Posted by Brackhar
Auto cast is typically a little less intuitive. We used it on Promote because we didn't want people confused when trying to cast it on a normal minion and not have it work. That being said, if you guys can make a good argument for why it should switch I am down for it.
One more thing, if you cast promote I hope it promotes the LOWEST health minion rather than the closest one that is in range. Most people will pop their promote when the minions are right at the tower and after they take a few hits.