In Magic: The Gathering , the most powerful element isn't fire, air, or water, but the element of surprise
Each commander deck must have exactly 100 cards, including the legendary creature that leads your deck
If an adventurer card ends up in exile for any other reason than by exiling itself while resolving, it won't give you permission to play it with its primary characteristics
(Xyz Materials on that monster also become Xyz Materials on this card.) As long as this card is face-up on the field, Level 5 or lower monsters cannot declare an attack
Red Elemental Blast was printed as an instant rather than an interrupt, making half of its ability unplayable under the rules of the time
I don't think it's very fun, but it might be good