Target 1 face-up monster your opponent controls; send 1 LIGHT and 1 DARK monster from your Deck to the GY, whose combined ATK is less than or equal to that monster's, also for the rest of this turn after this card resolves, you can only activate 1 monster effect in the GY. You can only activate 1 "Eternal Chaos" per turn.
Atom 1.0
