Gorgonic Guardian

 This monster is based on the Gorgon, a mythological creature. Its effect of making monsters' ATK become 0 is a reference to the Gorgon's ability to turn people into stone.

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Furthermore, Nash used a mirror shield to defeat this monster, referencing how Medusa was defeated by Perseus.  

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This monster has heterochromia (its left eye is red, while its right eye is blue).

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Gorgonic Guardians where the monsters with the soldiers of Vector's army in his past life.

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This monster appears in the artworks of Gorgon Charm, Gorgonic Ritual and Gorgonic Temptation.

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This card is similar to Mist Bird Clausolas as both are Level/Rank 3 monsters with an effect that makes the ATK of an opponent's monster 0 and negates its effects for one turn.

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In the English dub, the music used for a Number monster being Summoned was used for the Summoning of this card.

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OCG Rulings

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The "its ATK becomes 0, and if it does, its effects are negated." effect is a Quick Effect. (This effect targets 1 face-up monster your opponent controls.): Gorgonic Guardian

Detaching 1 Xyz Material from this card is a cost to activate the "its ATK becomes 0, and if it does, its effects are negated." effect.

The "its ATK becomes 0, and if it does, its effects are negated." effect can also be activated during the Damage Step, but not during damage calculation.

The "Once per turn: You can target 1 monster on the field with 0 ATK; destroy it." effect is an Ignition Effect. (This effect targets 1 monster on the field.)

You cannot target an Effect Monster with 0 ATK with the "its ATK becomes 0, and if it does, its effects are negated." effect.: Q: Can you target an Effect Monster with 0 ATK with the "its ATK becomes 0, and if it does, its effects are negated." effect of "Gorgonic Guardian"?

You can target a Normal Monster with the "its ATK becomes 0, and if it does, its effects are negated." effect. (The "its ATK becomes 0" is applied, but since a Normal Monster doesn't have any effect, the "its effects are negated." is not applied. Also, this effect cannot target a Normal Monster with 0 ATK.: Q: Can you target a Normal Monster the "its ATK becomes 0, and if it does, its effects are negated." effect of "Gorgonic Guardian"?