core 2015 booster box Set Magic French Duels of the Planeswalkers Magic 2015 Core Set (m15):

At the end of the Damage Step, when the equipped monster attacks an opponent's monster, but the opponent's monster was not destroyed by the battle: You can make the opponent's monster's ATK 0 (even after this card leaves the field or the monster becomes unaffected by card effects), and if you do, the equipped monster can make a second attack on the same monster in a row

Based on the Yu-Gi-Oh

With this much Singleton-breaking in service of the learn mechanic (which increases consistency), the experience was starting to feel too repetitive and needed a total rework

[8] Kite arrived at Duel Academy with Yusho and Alexis, wondering if they were walking into a trap when there were no Duel Academy soldiers waiting for them