Activate 1 of these effects;
●Discard 1 WATER monster to the GY, then target 1 face-up monster your opponent controls; destroy it.
●Destroy 1 FIRE monster in your hand, then you can draw 1 card.
If only your opponent controls a monster: You can banish this card from your GY, then target 1 Level 7 or 8 WATER or FIRE monster in your GY; Special Summon it. You can only use each effect of "Firestorms Over Atlantis" once per turn.