Rastakhan's Rumble Guide
Draw a card for each damaged friendly character.
"You won't like me when I'm angry."
Fits perfectly in new Patron enrage deck :
2 mana to draw 2 cards is already pretty decent, but in many scenarios this will be a 2-mana Sprint, a card which usually costs 4 mana and a Preparation. This card is the backbone of Grim Patron Warrior, and will likely end up nerfed to 3 or even 4 mana sometime in the near future. Until then... EVERYONE! GET IN HERE!
I think this card is a sleeper op. Control warrior plays few minions, so no one ever looked at this card twice, but with grim patrons and the possible return of aggro warrior... people will cry for nerfs to this card.
Lots of people seem to identify the minions in the combo of the Patron Warrior deck as the culprits, but your insight/prediction about Battle Rage is spot on.
So annoying right after your opponent drops Whirlwind