It seems excellent with buffs, like blessing of kings. Then you attack for 12 damage! It could be and OTK deck. Turn 6 nightmare, turn seven blessing of kings, and 2 blessing of mights for 24 damage.
Fun to Cabal Shadow Priest!
They've tried to push for beast druid the last adventures and expansions, so it doesn't surprise me that they drop a buff card with beast synergy for druid (who already has a decent amount of buff cards.