The Wandering Emperor does such a good job of protecting players, keeping them alive longer with a trifecta of removal, life gain, and tokens, while also forcing aggressive decks to spend crucial attacks taking her down
That doesnt mean blue isnt the best color for drawing cards, because thats specifically its slice of the color pie
Even some common-looking cards can be worth money due to print errors, age, or tournament legality
Creatures that can transform are special in that they have two faces
Urza block was a disaster for a reason, and I haven't even touched on some other broken as hell cards like Yawgmoth's Bargain, Gaea's Cradle, or the various "free" spells either
Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Wrecking Ball Arm, are still equip abilities, and their costs will be reduced by Cloud's last ability