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Popular Elemental Hero Yu-Gi-Oh

Inflict 600 points of damage to your opponent's Life Points for each face-up LIGHT monster on your side of the field

You can only use this effect of "Red Resonator" once per turn

So, they could be for example the Destiny Hero package, some Bystials, Radian, some Shaddolls, etc

It needs to say TRADING CARD GAME in all capital letters and after the exclamation point in Yu-Gi-Oh!, it need to have (Trademark) next to it as shown

Gentlemander X LIGHT Level 4 [ Reptile / Effect ] ATK 1200 DEF 1000 When an opponent's monster declares an attack: You can Special Summon this card from your hand