I am just a fan
But you dont need to panic, as MTG Arena rewards you with enough gold to fire some Quick Drafts every three days or so if you do the 500 and 750 gold Daily Quests plus achieving some game wins here and there

Adeliz, the Cinder Wind Aegar, the Freezing Flame Alania, Divergent Storm Ant-Man, Elusive Avenger Arjun, the Shifting Flame Astonishing Spider-Man Balmor, Battlemage Captain Baral and Kari Zev Baxter Stockman Bilbo, Retired Burglar Breeches, the Blastmaker Bria, Riptide Rogue Brudiclad, Telchor Engineer Captain Howler, Sea Scourge Captain Storm, Cosmium Raider Captain Vargus Wrath Dalakos, Crafter of Wonders Don & Raph, Hard Science Eris, Roar of the Storm Eruth, Tormented Prophet Farideh, Devil's Chosen Firkraag, Cunning Instigator Galazeth Prismari Gandalf the Grey Ghyrson Starn, Kelermorph Hawkeye, Avenging Archer Ian Malcolm, Chaotician Iceman and Firestar Idris, Soul of the TARDIS Iron Lad, Young Avenger Iron Man, Master of Machines Iron Man, Titan of Innovation Jenny Flint Jhoira of the Ghitu Jhoira, Ageless Innovator Jhoira, Weatherlight Captain Johann, Apprentice Sorcerer Jori En, Ruin Diver Kaza, Roil Chaser Keranos, God of Storms Kraum, Ludevic's Opus Kraum, Ludevic's Opus Kraum, Violent Cacophony Kylox, Visionary Inventor Lilah, Undefeated Slickshot Lozhan, Dragons' Legacy Ludevic, Necro-Alchemist Lutri, the Spellchaser Magnus the Red Malcolm, the Eyes Mary Read and Anne Bonny Melek, Izzet Paragon Melek, Reforged Researcher Mizzix of the Izmagnus Mm'menon, Uthros Exile Muddle, the Ever-Changing Myra the Magnificent Najal, the Storm Runner Neera, Wild Mage Nin, the Pain Artist Niv-Mizzet, Dracogenius Niv-Mizzet, Parun Niv-Mizzet, Visionary Niv-Mizzet, the Firemind Ovika, Enigma Goliath Prismari, the Inspiration Professor Zei, Anthropologist Quicksilver, Speedster Red Death, Shipwrecker Red Ghost, Intangible Genius Rielle, the Everwise River Song

One such format was simply known as 5-color. In this format, players used a deck of at least 250 cards with a minimum of eighteen cards of each color