(It cant be blocked, targeted, dealt damage, enchanted, or equipped by anything controlled by those players.) Fateful hour If you have 5 or less life, you cant lose life this turn, you cant lose the game this turn, and your opponents cant win the game this turn
Tech Cards : Flexible options adjusting the deck for specific matchups or personal playstyle
(2021-03-19) If you cast a spell with flashback, you can't pay any alternative costs such as overload costs
Error Cards Certain cards have spelling errors, formatting issues, misprints, or other mistakes that turn an otherwise unremarkable card into a rare collectors item
There's also a variation called modal double-faced cards, where you choose which side you want to play and there's no transformation to the other side
This could also have to do with any of the promotional decks (as shown in Chansey Picks), to make things predetermined saves a lot of additional coding and editing what already exists