Its a fixture in the Legacy metagame, mainly because there are so many ways to customize the deck to suit your playstyle
In decks that might not have as much to do early as they build towards their more expensive cards, this serves as a great way to keep filtering through your deck and building up your resources to get there

Commander : Loran, Disciple of History Creatures : Anafenza, Kin-Tree Spirit, Angel of the Ruins, Brass Secretary, Copper Gnomes, Crovax, Ascendant Hero, Daring Archaeologist, Daxos, Blessed by the Sun, Foundry Inspector, Hollow One, Hope of Ghirapur, Ironsoul Enforcer, Jhoiras Familiar, Konda, Lord of Eiganjo, Kongming, Sleeping Dragon, Liberator, Urzas Battlethopter, Loran of the Third Path, Losheel, Clockwork Scholar, Oswald Fiddlebender, Rebbec, Architect of Ascension, Reveillark, Salvage Scout, Sigrid, God-Favored, Sojourners Companion, Spirited Companion, Steel Seraph, Teshar, Ancestors Apostle, Treasure Hunter, Yomiji, Who Bars the Way, Zetalpa, Primal Dawn Artifacts : Avacyns Memorial, Cloud Key, Commanders Sphere, Conjurers Closet, Dispellers Capsule, Hedron Archive, Heros Heirloom, Ingenuity Engine, Inspiring Statuary, Mind Stone, Platoon Dispenser, Semblance Anvil, Sword of the Chosen, Tenza, Godos Maul, Thran Temporal Gateway Enchantments : Day of Destiny, Flickerform, Teleportation Circle Planeswalker : Ugin, the Ineffable Instants : Astral Confrontation, Banishing Stroke, Mana Tithe, Path to Exile, Swell of Courage, Your Temple Is Under Attack Sorceries : Akromas Vengeance, Austere Command, Board the Weatherlight, Mine Excavation, Refurbish, Search for Glory, Sevinnes Reclamation, Urzas Ruinous Blast Lands : 27 Plains, Ancient Den, Darksteel Citadel, Desert of the True, Drifting Meadow, Guildless Commons, Inventors Fair, Reliquary Tower, Secluded Steppe, War Room Loran Recursion for Beginners One thing that I certainly value in a Commander deck is when they can play the role of an introduction to a specific archetype

Charizard is, without a doubt, one of the most valuable Pokemon to collect in the TCG, and the Inferno X set is dedicated to paying homage to its Mega Evolution X form
Counterspell and Fatal Push hold price tags of about $1.50 and $2, respectively
I've heard all the counterarguments at this point, so here are a few attempts that were made to defend this card: "OCG has a more diverse metagame, so Maxx C clearly can't be that bad." No, OCG has more smaller-scale events