Seem's ok'ish in a warrior whirlwind deck. 2dmg to all other minions is 2-2.5'ish mana value, if it hits at least once, so a 6/6 for 5, with the chance for repeated AE hits.
And 7 for a 6/6 isn't completely awful even without the effect going off, not great, but not a wasted turn per say.