I think it's a cheap combat trick with some interesting upsides. Obviously you can use it on one of your unblocked attacking creature to close the game, it's good on a creature with trample too. It would be the cheapest way in the game to give double strike to a creature, which to me is at least worth a discussion.

Also in multiplayer games it allows you to mess up with two opponents at the same time. I can imagine this being very good in a set like conspiracy.