Odd-Eyes Venom Dragon (anime)

If this card was Fusion Summoned this turn using only monsters on the field as Materials: You can make this card gain ATK equal to the combined ATK of all monsters your opponent currently controls, until the end of this turn. Once per turn: You can target 1 face-up monster your opponent controls; until the end of this turn, that monster has its effects negated, and replace this effect with that monster's original effects. If this card is destroyed: You can target 1 card in your Pendulum Zone; Special Summon it, and if you do, place this card in your Pendulum Zone, then destroy as many monsters your opponent controls as possible, and if you do that, inflict damage to your opponent equal to the total ATK those destroyed monsters had on the field.