I assume by "someone else" they mean any other character, even friendly, which makes this card quite a strong aggro card. However I never like such RNG effects and there should never be a good card with such effect.
This card could be way better than people are thinking, based on how the mechanic is implemented. If it acts like the hunter Misdirection trap, and can force enemy minions to attack each other or the enemy hero, it is clearly a powerful card (not meta-defining, but very good); however, if it only effects your minions and hero, it is significantly worse and could actually be a liability in some cases (most notably when your opponent plays large and powerful rush minions that normally can't target face).
Also, I wish that this were a 4/7 taunt because that would make much more effective use of the ability.
The wording of this card is definitely inconsistent and confusing. It seems like it’s saying attack another character which would mean even your own face or minions as the attacker. But it doesn’t say that... maybe old Ben Brode pops out of the screen and smacks you while laughing maniacally. I dunno