Im gonna go to master duel meta for a guide on this. I need an explanation not just footage. There's a rule I don't understand that causes players to mess up this otk. I know what happy memory does and I understand why it should work. It grants extra attacks. But both me and my opponents ran into an issue where the 2nd attack isn't allowed.
It only gains attack on opponent monster so if the said monster doesn't have delicious protection on them and you destroy them then you can't do the otk