Harmonic Oscillation is a Short Print Spell Card card from Yu-Gi-Oh! (Crossed Souls, CROS). Current market price: $0.10.
Short Print
Crossed Souls (CROS)
Card Text
If your opponent has 2 cards in their Pendulum Zones: Target those 2 cards; while both targets are in their Pendulum Zones, you can Pendulum Summon using their Pendulum Scales this turn, but only from the Extra Deck.
