Hearthpwn

This boss was a pain for me. I tried a few of the archtypes popular on here, and they constantly lacked either end-game or control. Then I thought, why not make a big-control priest with Malygos for an easy win?

Such a simple formula. And, effective.

Control the game using priest spells. Cheat out a 5/5 Malygos (you might need to reset if you get the dragon in your hand beforehand). Let Malygos die, then resurrect when you have damage dealing spells for Sapphiron's face. Stupidly easy.

You could change this deck up plenty to suit yourself, as long as you have the one key: only a single minion, named Malygos, in your deck.