Gameplay and Story Segregation: In the OCG, Number 100: Numeron Dragon requires two Number monsters with the same name and Rank as Xyz Materials for its Xyz Summon, which goes against the premise in both the ZEXAL anime and manga that Numbers are unique cards, and there being only one copy of each in existence
"You're getting graded perfect examples of those cards, so the population of these cards is very low
Once per turn, if another card(s) you control is destroyed by battle or an opponent's card effect: You can attach 1 card from your hand, Deck, or Extra Deck to this card
Each Happy Meal box will include one of four dragon Pokmon designs: Fire/Flying type Charizard (I know, but it gets its Dragon typing with its Mega Evolutions, so it counts)
The Big Switcheroo Volatile Stormdrake While I dream of a deck whose only purpose is to amass enough energy to swap a Volatile Stormdrake with, for instance, an opposing Volatile Stormdrake feels like it could be at home in a similar type of deck as an especially potent way to pull the rug out from under opponents just when they think they've landed a creature that might help them put the game away