Sending one Gemini Monster from your hand to the Graveyard is a cost to activate the effect of " Black Brutdrago" which destroys an opponent's Spell or Trap Card. This effect targets one Spell or Trap Card your opponent controls.
Konami Gameplay FAQ: Stardust Overdrive Sneak Peek -- Card Rulings (Version 1.0) ↑
2.0 2.1 2.2
Konami FAQ: Synchro Monster > Black Brutdrago
Konami FAQ: [Damage Step] When "Black Brutdrago" is destroyed during the Damage Step, can its effect be activated? ↑
Konami FAQ: If "Eccentric Boy" is used as a Synchro Material Monster to Synchro Summon "Dark End Dragon", then can you use a non-DARK Synchro Material Monster from your hand?
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