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When your opponent activates a monster effect, while you control a "Therion" monster: You can activate 1 of these effects; ● Negate that effect. ● Banish that monster. If you have "Endless Engine Argyro System" in your GY at activation, you can activate both effects (at resolution, negate, then banish). You can only activate 1 "Therion Cross" per turn.

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