Out of more than 3,000 PSA submissions, a mere 121 have achieved the Gem Mint distinction PSA 10
Pass the Popcorn: In the English dub of episode 23, Jack and Goodwin watch Yusei get pounded by Akiza when Jeager/Lazar makes the comment "I'll get the popcorn" during the Fortune Cup
As the video game series has seen the cast of collectible creatures expand from the original 151 to over 1000 Pokemon, so too has the Trading Card Game seen its selection of cards and creatures expand to become a huge selection
Not only is it difficult to determine which cards are good enough, there has to be enough other cards that also pair well with them in order to make a wedge viable in the Standard metagame
Treasure Cruise + Dig Through Time Any mechanic that lets you pay mana costs with a resource other than mana is at least a little broken
Basically, Copy Knight can only be activated when a Level 4 or lower Warrior-type monster is summoned (aka Midfielder) and this Trap Monster summons itself with its card name