This is not a new legendary, this is the BlizzCon promo card. It has to be fun, not good.
If it were even only playable it would have been bad, cause u can't obtain it through any means later on (until rotation at least, considering how it worked out for Elite Tauren Chieftain and Gelbin Mekkatorque).
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saw a comment above that expressed exactly what i was thinking, if that ever becomes meta you can see silence/simple otk priest come back.... hey you can even play marin+potion of madness+ inner fire in the same turn for 8 easy dmg