I've pondered about the banlist for long time, and in my local meta we have an ongoing discussion about creating our own banlist, because we don't think that the rules comittee has any good idea of EDH when it comes to anything but casual timmies. So I kinda have already created a few version of an unbanlist, but it is very hard to predict the power of a few cards. I'll make 3 lists below to show what I think of the cards respectivly:

1: Cards that I would probably not unban:

-> [[Black Lotus]]

-> [[Channel]]

-> [[Karakas]]

-> The Moxen

-> [[Time Vault]]

-> [[Time Walk]]

-> [[Sway of the Stars]] (degenerate)

-> [[Worldfire]] (degenerate)

-> [[Trade Secrets]] (degenerate)

2: Cards I would test before unbanning, because they might be too strong:

-> [[Ancestral Recall]]

-> [[Balance]]

-> [[Gifts Ungiven]]

-> [[Leovold, Emissary of Trest]] (as commander?)

-> [[Limited Resources]]

-> [[Panoptic Mirror]]

-> [[Tinker]]

-> [[Tolarian Academy]]

-> [[Yawgmoth's Bargain]]

3: Cards I don't think would have any serious impact or simply aren't busted:

-> [[Biorhythm]]

-> [[Braids, Cabal Minion]]

-> [[Coalition Victory]]

-> [[Emrakul, the Aeon's Torn]]

-> [[Erayo, Soratami Ascendant]]

-> [[Fastbond]]

-> [[Griselbrand]]

-> [[Library of Alexandria]]

-> [[Painter's Servant]]

-> [[Primeval Titan]]

-> [[Prophet of Kruphix]]

-> [[Recurring Nightmare]]

-> [[Rofellos, Llanowar Emissary]]

-> [[Sundering Titan]]

-> [[Sylvan Primordial]]

-> [[Upheaval]] (I'm not so sure about this one, might as well fit in the category above)