Hearthpwn

It's a dead card for at least 8 turns, win before turn 9 if you're aggro or keep your health total high enough if you're control.

Force them to use Alex for the heal or to target one of your minions.

There are many ways to deal with it, and paladin's winrate aside, if aggro decks are consistently running 9 mana cards, it means the game is in good shape. You should be thankful that aggro decks don't end their curve at 4 mana.