Retro Frame EDH

All cards with the original frame are legal. This includes everything printed from Alpha though Scourge (including supplemental sets), as well as any card printed afterward with the "Retro" frame. 

Ante cards are legal, but your opponents must agree to play for ante. Otherwise any ante cards will need to be replaced. 

A full list of legal cards can be found on Scryfall, using the filter "is:old".