Here I want you to post card rulings that are supposed to be common knowledge among duelists, but everyone you come across seems to get wrong.
The one ruling that was on my ruling exam but is not anymore that everyone seems to get wrong is: Can Stardust Dragon still use its effect while equiped to a Fiendish Chain? The answer is yes it can use the effect since it Tributes as cost then resolves in the grave where it is unnaffected by Fiendish Chain. ONly one person I tested has gotten the ruling correct.