Soon you shall be a skyknight. Arna Kennerd, skyknight Illustrated by Dan Frazier Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
This material appears in the cards' artwork as a dark gray metal with yellow motes of energy swirling around it
On their WeeklyMTG stream on Twitch, they showcased a bunch of new cards, as well as a great many treatments for those cards
This creates a bit of a conundrum

Chaotic Ruhan | Commander | Matthew Lotti Commander (1) 1 Ruhan of the Fomori Creatures (14) 1 Aegar, the Freezing Flame 1 Arashin Foremost 1 Calamity Bearer 1 Combat Celebrant 1 Cyclone Summoner 1 Flamekin Herald 1 Halvar, God of Battle 1 Kediss, Emberclaw Familiar 1 Koll, the Forgemaster 1 Raiyuu, Storm's Edge 1 Realm-Cloaked Giant 1 Selfless Samurai 1 Stoneforge Mystic 1 Stonehewer Giant Planeswalkers (1) 1 Jeska, Thrice Reborn Instants (15) 1 Chaos Mutation 1 Chaos Warp 1 Cyclonic Rift 1 Jwari Disruption // Jwari Ruins 1 Kazuul's Fury // Kazuul's Cliffs 1 Order // Chaos 1 Psychotic Fury 1 Resolute Strike 1 Response // Resurgence 1 Sejiri Shelter // Sejiri Glacier 1 Shelter 1 Slip Out the Back 1 Temur Battle Rage 1 Unleash Fury 1 Valakut Awakening // Valakut Stoneforge Sorceries (13) 1 Distortion Strike 1 Divine Reckoning 1 Fire Giant's Fury 1 Irenicus's Vile Duplication 1 Mystic Retrieval 1 Open the Armory 1 Promise of Loyalty 1 Sea Gate Restoration // Sea Gate, Reborn 1 Seize the Day 1 Single Combat 1 Slash the Ranks 1 Slip Through Space 1 Steelshaper's Gift Enchantments (7) 1 Duelist's Heritage 1 Fiery Emancipation 1 Giant's Grasp 1 Mantle of the Ancients 1 Security Bypass 1 Steel of the Godhead 1 Unquestioned Authority Artifacts (18) 1 Arcane Signet 1 Assault Suit 1 Azorius Signet 1 Champion's Helm 1 Cursed Mirror 1 Ebony Fly 1 Embercleave 1 Helm of the Host 1 Lightning Greaves 1 Meteoric Mace 1 Obsidian Battle-Axe 1 Robe of Stars 1 Sol Ring 1 Swiftfoot Boots 1 Talisman of Conviction 1 Talisman of Progress 1 The Reaver Cleaver 1 Two-Handed Axe Lands (31) 2 Island 3 Mountain 3 Plains 1 Adarkar Wastes 1 Arid Mesa 1 Battlefield Forge 1 Cascade Bluffs 1 Flooded Strand 1 Hall of Heliod's Generosity 1 Hallowed Fountain 1 Inspiring Vantage 1 Mystic Gate 1 Plaza of Heroes 1 Raugrin Triome 1 Rugged Prairie 1 Sacred Foundry 1 Scalding Tarn 1 Sea of Clouds 1 Seachrome Coast 1 Shinka, the Bloodsoaked Keep 1 Shivan Reef 1 Slayers' Stronghold 1 Spectator Seating 1 Spinerock Knoll 1 Steam Vents 1 Training Center Ruhan of the Fomori needs only three hits to spell doom for an opponent

You can then add three mana in any combination of those colors to your mana pool