I recently went on a look through the Magic archives to see if there was any more viable land to be added to the cube and found very little left of interest
The colors are solid enough that you can't see the card through the back of the sleeve, which is a good thing

Aang, Air Nomad Aang, the Last Airbender Abbey Gargoyles Abbey Griffin Absolving Lammasu Abzan Falconer Abzan Skycaptain Acrobatic Cheerleader Adarkar Valkyrie Ademi of the Silkchutes Admonition Angel Aegis Angel Aerial Extortionist Aerial Responder Aerial Toastmaster Aerialephant Aerie Auxiliary Aerie Mystics Aeronaut Admiral Aeronaut Cavalry Aetherstorm Roc Ageless Sentinels Air Nomad Student Airdrop Aeronauts Airlift Chaplain Akroan Skyguard Akroma, Angel of Wrath Akroma, Vision of Ixidor Alabaster Dragon Alabaster Kirin Alaborn Musketeer Alharu, Solemn Ritualist Amazing Spider-Girl Ambush Paratrooper Ancestor Dragon Ancient Gold Dragon Angel of Condemnation Angel of Deliverance Angel of Destiny Angel of Finality Angel of Flight Alabaster Angel of Fury Angel of Glory's Rise Angel of Grace Angel of Indemnity Angel of Invention Angel of Jubilation Angel of Light Angel of Mercy Angel of Renewal Angel of Retribution Angel of Salvation Angel of Sanctions Angel of Serenity Angel of Vitality Angel of the Dawn Angel of the Dire Hour Angel of the God-Pharaoh Angel of the Ruins Angelic Aberration Angelic Arbiter Angelic Cub Angelic Curator Angelic Enforcer Angelic Field Marshal Angelic Guardian Angelic Observer Angelic Overseer Angelic Page Angelic Protector Angelic Quartermaster Angelic Sell-Sword

Karrthus, Tyrant of Jund Karrthus, Tyrant of Jund is a dream dragon commanderflying, haste, and a mass dragon theft ability when it enters
This mana cost is the primary appeal of the creature, as it guarantees that you'll have access to this commander whenever it may be needed without requiring access to mana
Still, it will be effective and might be a good place to start as a commander player and modify as you go