Heroics are some of the most powerful cards in the game, but they require you to build your Heroism before you play them, and you accomplish this by playing non-Heroic cards. Problem is, your hand maxes out at six cards, meaning if you draw too many Heroics in a single turn, you’ll be stuck with all those great cards and no way to play them. Try to keep your Heroics at 2 or 3 per hero.