Second-Third
Ever since he was released, Emperor Thaurissan has been an extremely powerful. He immediately found a place in many combo decks, but has since spread to slower decks in general. His power is incredible. Playing him with four cards in hand is two free Innervates you can cash in on when you need them. He enables crazy combos, and works with a host of other cards. He is especially strong in Mage decks, as he works with Archmage Antonidas and their many low cost spells.
Emperor Thaurissan was also in eight decks we analyzed. He was in several Mage and Druid decks. Druid decks make use of him extremely well because they can Innervate him out, and basically prolong their Innervate’s effect.