White tends to be a colour of life and healing, helping the player to gain life points using its cards
All told I don't think it is worth lowering the consistency of the general theme of the deck to support the infinite mana combos, you have enough normally to cast all your things very fast

Voltron Geist of Saint Traft | Illustration by Igor Kieryluk Commander (1) Creature (24) Selfless Spirit Stenn, Paranoid Partisan Stoneforge Mystic Lion Sash Stone Haven Outfitter Puresteel Paladin Leonin Shikari Relic Seeker The Reality Chip Sram, Senior Edificer Tameshi, Reality Architect Etched Champion Cloudsteel Kirin Ardenn, Intrepid Archeologist Trophy Mage Armored Skyhunter Balan, Wandering Knight Halvar, God of Battle Padeem, Consul of Innovation Danitha, Benalia's Hope Stonehewer Giant Ayesha Tanaka, Armorer Sun Titan Heavenly Blademaster Instant (7) Enlightened Tutor Slip Out the Back Swords to Plowshares Stubborn Denial Counterspell Change of Plans Teferi's Protection Sorcery (4) Steelshaper's Gift Open the Armory Slash the Ranks Single Combat Enchantment (1) Artifact (25) Sol Ring Shadowspear Masterwork of Ingenuity Commander's Plate Lightning Greaves Conqueror's Flail Arcane Signet Robe of Stars Blackblade Reforged Mask of Memory Azorius Signet Swiftfoot Boots Sword of the Animist Umezawa's Jitte Sword of Body and Mind Sword of Light and Shadow Sword of Feast and Famine Sword of Fire and Ice Maul of the Skyclaves Sword of Vengeance Andril, Flame of the West Hammer of Nazahn Hexgold Hoverwings Batterskull Argentum Armor Land (38) Command Tower Myriad Landscape Mistveil Plains Rogue's Passage Temple of the False God Inventors' Fair Celestial Colonnade Prairie Stream Azorius Chancery Sea of Clouds Irrigated Farmland Adarkar Wastes Mistgate Pathway Temple of Enlightenment Port Town Glacial Fortress Hallowed Fountain Deserted Beach Island x8 Plains x12 A Voltron strategy focuses all its attention on building up one unstoppable threat and having that be your main wincon

A common but controversial form of therapy, ABA has an ugly history, and some argue it still focuses on training autistic children to behave more like neurotypical children instead of meeting their individual needs
As that trigger resolves, the battle is exiled and then the back face is cast without paying any mana cost which is handy as the back sides dont have mana costs, anyway