Your opponent cannot activate a Spell/Trap Card, or monster effect, when your "Solfachord" Pendulum Monster(s) is Pendulum Summoned.
Monster Effect
You can Special Summon this card (from your hand) by Tributing 2 Pendulum Monsters. You can only use each of the following effects of "DoSolfachord Coolia" once per turn. You can target 1 face-up card your opponent controls, or up to 2 cards if you have an odd Pendulum Scale in your Pendulum Zone; negate its effects until the end of your opponent's turn. When an effect of a monster on the field is activated, with an equal or lower ATK than the highest Pendulum Scale in your Pendulum Zone x 300: You can destroy that monster.
