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Armed Dragon Thunder LV10 X WIND Level 10 [ DragonEffect ] ATK 3000 DEF 2000 If this card was Special Summoned by the effect of an "Armed Dragon" monster, it gains the following effects based on its ATK

Cartas Limitadas Limitada Dracocola Mululu X OSCURIDAD Nivel 3 [ Dragn / Efecto ] ATK 1100 DEF 1500 Durante la Main Phase (Efecto Rpido): puedes Invocar por Fusin, desde tu Deck Extra, 1 Monstruo de Fusin "Dracocola", usando monstruos en tu mano o Campo, y adems no puedes Invocar de Modo Especial desde el Deck Extra por el resto de este turno, excepto Monstruos de Fusin

In the game, what makes this difference is which Mega Stone you give it

How was this really any different, aside from putting different cards into that frame

Any "As [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature will also work