Effect
Send 1 face-up "Umi" you control to the Graveyard; send all Spell and Trap cards on the field to the Graveyard.
This effect does not target.
This card cannot be activated during the Damage Step.
When activating this effect, send 1 face-up "Umi" you control to the Graveyard as a cost.
If the only Spell/Trap Cards on the field are "Umi" and the "Abyss-strom" being activated, you cannot activate "Abyss-strom".
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