Until the end of this turn, the ATK of all "Harpie Lady Sisters" currently on the field becomes 2700, your opponent cannot activate any Trap Cards, also negate all your opponent's Trap effects on the field.
Rulings
Individual Card FAQs
You cannot activate "Triangle Ecstasy Spark" if "Harpie Lady Sisters" is not on the field. You can activate it if the opponent controls a "Harpie Lady Sisters". In that case the ATK of the opponent's "Harpie Lady Sisters" will become 2700, but the opponent still cannot activate Trap Cards, and the effects of Trap Cards on the opponent's side of the field are negated.
If there are multiple copies of "Harpie Lady Sisters" on the field, the ATK of each becomes 2700 until the End Phase.
If a Trap Card such as "Waboku" is chained to the activation of "Triangle Ecstasy Spark", the effect of "Waboku" resolves first, and will apply for the rest of the turn regardless of "Triangle Ecstasy Spark". (Just like if "Jinzo" is Summoned after "Waboku" is activated and resolves.)
Spell|
Normal