As far as I can tell the only formats anyone plays anymore is Commander. Players only need 1 of a card and not 4 of and there is a lot of interactive cards that are necessary for standard but are just worst than older cards so are never played in commander.
Pioneer:UR Pheonix
Modern:U Mono U Tron
EDH
GB Glissa, the traitor: Army of Cans
UW Dragonlord Ojutai: Dragonlord NOjutai
UWGDerevi, Empyrial Tactician "you cannot fight the storm"
R Zirilan of the claw. The solution to every problem is dragons
UB Etrata, the Silencer Cloning assassination
Peasant cube: Cards I own