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Not only do you get a damage ping for each spell cast, but Vivi starts to grow and then gives you access to a bunch of extra mana, probably enabling your bigger spells for the blue/red archetype

C Common Dark Illusion X TRAP Counter When a Spell/Trap Card, or monster effect, is activated that targets a DARK monster on the field: Negate the activation, and if you do, destroy that card

This article explores what they are and how they came to be

Limited Cards Limited Triple Tactics Talent X SPELL If your opponent has activated a monster effect during your Main Phase this turn: Activate 1 of these effects

All round a very good card