even if the health swing is the same, killing your opponent will always be better than surviving a bit longer. also i think the nocturnal pool is a bit harder to work with than airborne (eclipse may be a bit better than nerfed sofree i guess, but the pool itself is smaller). can probably make it 1 or 2 quanta cheaper still. or you make it give all of them 1 extra atk (but that kinda makes it too similiar to other cards)