If you control a Divine-Beast during the End Phase, all of your opponents face-up cards that activated an effect that turn are destroyed
The Dark Side of Dimensions and Yu-Gi-Oh
Once per turn, when you inflict damage to your opponent with a card effect, the equipped monster gains 1000 ATK until the End Phase
If the level had been, say, 50 or something, that would have been a lot more understandable, it would have made these cards invaluable in the late game, where you WILL be needing them, but apparently, that would help you too much
31890399 Fiend's Mirror 366
Hygiene requires all those attending the event to be clean and wear clean clothing. and then goes on state that penalties can be enforced if not properly adhered to