I think that the best for those are cards that have appeal across the board from EDH to totally casual and maybe competitive as well
In that case, Malleable Impostor simply enters the battlefield as a 0/0 creature and is probably put into your graveyard immediately, unless something else is increasing its toughness to keep it alive
The deck is highly committed to the theme, with 22 auras including bestow creatures, as well as other cards that create role tokens
Crypt Ghast is undoubtedly the best Extort card for Black decks, doubling the amount of mana your Swamps produce
Meta magic: These are the best MTG planeswalkers This alone has a lot of power to it - after all, it could let you cheat out a giant angel like Iona or Avacyn - but with the right support around it, Karmic Guide can be used to create all kinds of complicated, infinite, game-winning combos
But that simple "may" clause rules all