Mulligans
General Mulligans
Mulligan with this deck is very matchup specific but if you have absolutely no idea what you are up against generally aim for armor gain, whirlwind, and cycle.Aggro Mulligans
Versus aggro you want to go very whirlwind focused and clear their early boards without wasting too many resources if possible. Eater of Secrets is a must keep versus mage, but mage alone.
Midrange Mulligans
Whirlwind into an execute effect is usually the way to fight off midrange decks in the first turns until you can stabilize. It's not really a mulligan keep, but an early Garrosh can really help in these matchups.