i did not have an idea in mind, just suggested you look for something along the lines of being based off # of cards in hand (this idea is taken/being used, this is just an example), something novel, not super complicated, but interesting.
also, based on the current card text, i cant even know what this does anymore.
"Sacrifice one of your aether creatures. The summoning cost will equal to the damage all enemy creatures take +2."
okay, sacrifice a creature... but the summoning cost of what? what am i summoning? a creature- what creature? a spell- what does the spell do? does the 'summoning' cost increase if i damage creatures with spells/abilities? etc, etc, it is unplayably unclear as is. It is one thing to see "this will mutate a creature" and ask "what *exactly* is a mutation?" it's quite another to see "Sacrifice x and summoning cost is all damage to enemy creatures +2", which leads to a myriad of questions.