People are blowing this off, but in a control deck this is huge. I hate when they print win condition cards like this. If a shaman plays this, you either have a counter right away or you lose. 10 mana, summon 15/18 worth of stats that require a hard board clear. Rogue and druid have no counter for that. And remember, shaman has tons of spell discover to find this late game.
i mean, control must be a thing first, this could help but, i think electra dragons pack is still better at least til rotation