Watch S02yu-gi-oh 51 Direct

"Fool! Changing it to attack mode only makes it vulnerable, but it still has 2400 defense!"

"I change to Attack Position," Yusei declared. "Now, I activate the second effect of Synchro Backtrack —if the target has 0 ATK, I can special summon Stardust Dragon from my graveyard!" Watch S02Yu-Gi-Oh 51

"Now, the effect of !" the clone sneered. "When it is in defense mode, you cannot activate card effects, and if you attack it, your monster is destroyed!" The crowd gasped. The field was paralyzed. " Yusei declared. "Now