With Sixs attack trigger, you can return a land to your hand from your graveyard
Krenko, Mob Boss Aside from vanilla commanders, how much simpler do you want your commander to be than a body with an activated ability

Aang, Master of Elements Abrupt Decay Accursed Witch Advanced Reconstruction Aluren Animar, Soul of Elements Arcane Melee Archmage of Runes Armor Wars Artist's Talent Ballad of the Black Flag Ballyrush Banneret Baral, Chief of Compliance Bard Class Baron Strucker, HYDRA Overlord Because I Have Willed It Beluna Grandsquall Beluna Grandsquall Bilbo, Thief in the Night Bladegraft Aspirant Blood Funnel Bontu's Monument Bosk Banneret Brago's Favor Brighthearth Banneret Brisela, Voice of Nightmares Bronze Calendar Bureau Headmaster Call Forth the Tempest Captain Eberhart Case of the Ransacked Lab Cemetery Prowler Centaur Omenreader Chatzuk, Mighty Guitarist (playtest) Cheap Ass Cheering Fanatic Chimil, the Inner Sun Cid, Freeflier Pilot Cloud Key Collected Conjuring Commander Liara Portyr Council of the Absolute Cunning Nightbonder Danitha Capashen, Paragon Danitha Capashen, Paragon Daru Warchief Defiler of Dreams Defiler of Faith Defiler of Flesh Defiler of Instinct Defiler of Vigor Director Nick Fury Dirgur Focusmage Doc Aurlock, Grizzled Genius Dragonlord's Servant Dragonspeaker Shaman Dream Chisel Edgewalker Elderwood Scion Emerald Medallion Emet-Selch of the Third Seat Enthusiastic Mechanaut Epic Experiment Esper Etherium Sculptor Eye of Ugin Ezio Auditore da Firenze Ezzaroot Channeler Feeding Grounds Finale of Promise Fires of Invention Fleem, Goben's Creation

Promo cards come from tournament prizes , movie tie-ins , box toppers , and brand collaborations like McDonalds