Soul Pendulum (DUPO-EN013) [Duel Power]

You can target 2 cards in your Pendulum Zones; change each target's Pendulum Scale by 1 (min. 1). You can only use this effect of "Soul Pendulum" once per turn. Each time your Pendulum Monster(s) is Pendulum Summoned, place 1 counter on this card. Pendulum Monsters on the field gain 300 ATK for each counter on this card. You can remove 3 counters from this card; during your Main Phase this turn, you can conduct 1 Pendulum Summon of a monster(s) in addition to your Pendulum Summon. (You can only gain this effect once per turn.)