Sangenpai Transcendent Dragion

1 Dragon Tuner + 1+ non-Tuner Dragon monsters All monsters your opponent controls must attack, if able. Your opponent cannot activate cards or effects during the Battle Phase. If this card is Synchro Summoned: You can change all monsters on the field to Attack Position. 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.