Mysterious Tome This is just such clever design that it had to go on my list, even if its not the most powerful
Many of these are references to some very old cards, from the earliest sets in Magic's existence, or the first set with Legendary cards, the eponymous Legends
Not every instance checks out based on how the prices can sometimes be reported and not every instance shows you an opportunity to make money, but the cheaper version on CK is the foil from The List and that card is like $9 on TCG Player, so someone is wrong
That could mean they become more powerful, but it doesnt have to
[On K type card and add it to your hand
Delayed Blast Fireball Red has plenty of burn-based board wipes, but its rare to see a card like Delayed Blast Fireball at instant speed