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Description
If your opponent activates a Spell/Trap Card, or monster effect, while you control an "Alteri" monster: Negate the activation, and if you do, destroy that card. You can only activate 1 "Alteri Spiral" per turn.

Description
If your opponent activates a Spell/Trap Card, or monster effect, while you control an "Alteri" monster: Negate the activation, and if you do, destroy that card. You can only activate 1 "Alteri Spiral" per turn.