Reptilianne Viper

 This card, along with “Reptilianne Gardna” and “Reptilianne Servant”, are the only Reptilianne monsters to not be based on a mythological figure.

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An argument could be made though for this card being inspired by the Naga of Indian mythology, just like “Reptilianne Naga”.

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Despite the name, this monster resembles a king cobra rather than a viper.

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This card's effect is a unique twist to the effect of Junk Synchron, Black Salvo, Blackwing - Blizzard the Far North and the like. This card is the only Tuner monster that allows you to gain control of an opponent's monster (although it has to have 0 ATK)

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This card appears in the artwork of Tuning Barrier.

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TCG Rulings

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This effect targets 1 face-up monster with 0 ATK your opponent controls.: Stardust Overdrive Sneak Peek -- Card Rulings (Version 1.0)

You keep control of the monster taken by this effect even if it is flipped face-down or its ATKturned flipped face-down by an effect Chained to the effect of "Reptilianne Viper", you do not gain control of that monster.

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OCG Rulings

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The effect of "Reptilianne Viper" targets one face-up monster on your opponent's side of the field with 0 ATK.: Effect Monster > Reptilianne Viper

If you gain control of a monster via the effect of "Reptilianne Viper", then you retain control of the monster, even if its ATK is no longer 0 or if the monster is flipped face-down by an effect like "Book of Moon".: If a monster whose control you gained via the effect of "Reptilianne Viper" no longer has 0 ATK or is flipped face-down, then does control of it return to the opponent?

Referernces