Sangenpai Transcendent Dragion

1 Dragon Tuner + 1+ non-Tuner Dragon monsters
If this card is Synchro Summoned: You can change all monsters on the field to Attack Position. All opponent's monsters must attack, if able, also your opponent cannot activate cards or effects during the Battle Phase. If 3 or more attacks have been declared this turn (Quick Effect): You can Special Summon this card from your GY, then you can destroy 1 card on the field. You can only use this effect of "Sangenpai Transcendent Dragion" once per Duel.