These are: Alien Ally Broom Captain Deity Detective Dragon Fairy Hero Hyena Inventor King Knight Mentor Musketeer Pirate Prince Princess Puppy Queen Seven Dwarfs Sorcerer Tigger Titan Villain What are Storyborn, Dreamborn, and Floodborn cards
They're a topic that generates a lot of impassioned discussion, mostly because every time they come up, everyone starts arguing about the affordability of Magic and how WotC makes the game too expensive to play. There is increasing acceptance of proxies in certain situations , especially provided you are not trying to use fake cards and pass them off as real or using them in tournaments where they're not allowed
They can lead to awkward opening hands, and if there are too many of them, a mulligan might be in order
This is another example of a commander that gets worse in the late game when there are fewer players
Its normal spell exiles cards from the top of a players library, which can occasionally disrupt top-deck tutors or enable weird setups