The Valkyrie is played mainly in angel decks, but it can be played in cleric decks and decks that value lifegain
The Gear Five Luffy is still the most valuable Manga Rare card, and even though the reprint slashed its price by more than half, you still have to drop a grand just to add it to your collection
For the purpose of this list, we do not including cards that say you lose the game to prevent rules exploit and loops, like Enduring Angel
There's been a lot of print variance over the years, and when you add in special printings like Challenger Decks reusing the same set symbols for cards produced by different printers at different times, or cards printed in other regions, there are often subtle but noticeable differences between legitimate identical cards
Creature - Dinosaur Creature (CTRL to add secondary) Draw Bonehoard Dracosaur Flying, first strike At the beginning of your upkeep, exile the top two cards of your library
Then there's this guy, who unfortuantely isn't a horse