Blue Light Special

Devolve (Whenever a creature enters the battlefield, if its power or toughness is less than this creature's, put a -1/-1 counter on this.)
Adapt {x}{u}{r}{g} (If this creature has no +1/+1 counters on it, put X +1/+1 counter on it.)
Somehow, for hours, the moon remained in sight. Then we discovered it wasn't the moon.