This was originally "become X/X" which was cleaner, but allowed green Wrath of God/Black Sun's Zenith which obviously doesn't work. I considered not letting X be zero, but I liked the idea you could use it that way if you wanted, so it became this.

It still obsoletes fog, but I like the simlpicity. X=0 for fog, X=1,2,3,4 to fiddle combat stats, X=5+ for psuedo-overrun :)

Niiice!

Also exploitable. I think it overrides bonuses from Equipment, but I'm pretty sure it allows counters such as +1/+1 counters and -1/-1 counters to still have their effect on top of this. So it's a one-sided fog for a graft deck :)

(Which is fine; see Moonmist.)

Are you sure? Setting power/toughness is done in layer 7b, whereas modifiers are done in 7c.

Ah, you're right. So it's even more exploitable: equipment and Giant Growth effects will also sit on top of this. (Equally, it doesn't work as an answer to Meishin, the Mind Cage or similar effects.)

That's a strange name for something that will most often be used as a kill spell. Except when it isn't. You get the idea.

Yeah, I couldn't think of a good name, suggestions welcome :)