A Solfachord Deck is a Pendulum-based Fairy strategy built around musical scale numbers, with each “Solfachord” monster representing a different scale value that matters for its effects. The deck focuses on establishing proper odd and even Pendulum Scales to unlock bonus abilities, such as negation, bouncing cards, or Special Summoning from the hand or Extra Deck. Cards like Solfachord Cutia and Dreamia help search and extend plays, while the field spell and continuous spells/traps provide consistency and disruption when your scales are correctly arranged. The goal is to quickly set up balanced scales, Pendulum Summon multiple monsters at once, and use their effects to control the board through interruption and resource advantage, often finishing with Link or boss monsters while maintaining steady pressure through repeated Pendulum Summons.