This card is a lot better than people are considering.
It allows you to translate direct damage to creatures into damage to face. This is a psychotic combo with things like Sheoldred and can IMMEDIATELY murder people with the right setup

It doubling as an abstract kind of Phyrexian Arena means it's not as dead as it would be otherwise, too. I think it has a lot of potential for horribly vile play patterns, though I'm not sure if those patterns will pan out into something top tier.