Odd-Eyes Phantom Dragon - LEDD-ENC03 - Legendary Dragon Decks (2020 Date Reprint) Unlimited

Pendulum Effect: Once per turn, when an attack is declared involving a face-up monster you control and an opponent's monster, if you have an "Odd-Eyes" card in your other Pendulum Zone: You can make that monster you control gain 1200 ATK until the end of the Battle Phase (even if this card leaves the field).

Monster Effect: When this Pendulum Summoned card inflicts battle damage to your opponent by attacking: You can inflict damage to your opponent equal to the number of "Odd-Eyes" cards in your Pendulum Zones x 1200. You can only use this effect of "Odd-Eyes Phantom Dragon" once per turn.