- This effect cannot be activated during a turn in which you have already Special Summoned non-WATER monsters.
- During the turn that the effect of "Double Fin Shark" is used, non-WATER monsters can still be Flip Summoned. Furthermore, if the effect of "Double Summon" or "Ultimate Offering" is used, they can also Normal Summon/Set non-WATER monsters. (However, you cannot use cards like "The Shallow Grave" to Special Summon a non-WATER monster face-down.)
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