I think Traitorous Greed has the best potential in Zada, Hedron Grinder, where it's actually a super janky ritual that generates mana if you target Zada with it and have at least 2 other creatures on the battlefield
DREAD RETURN In theory, this is a fair card which offers two reasonably-costed bites at the reanimation apple
It has also been generally accepted that you couldnt get two copies of the same card in the same booster pack (unless the other one is its reverse foil version)
The fact that EDH is the dominant format for MTG and is a singleton format only helps the cause for serialized cards, as players are indeed willing to spend to bling out a favorite deck
A number of cards are banned for using rules that do not apply to modern Magic, like Ante or Conspiracy mechanics, while others are banned across all formats for being culturally insensitive
Two life actually hurts, as do lots of other things in the cube, friend and foe alike