United in Stormwind Cards List & Guide
Hero PowerDiscover a class spellthat has been playedthis game.
I think it's really important to note that if no class spells have been played, you get a small rock. (0 mana 1 damage)
This is super useful for triggering combo, Lock 'N' Load or any other reason you might want to cast a lot of spells in one turn. Very handy!