This ability always bottoms out at just one mana, but thats fine since the discount is so great
On its own it can dash in and deal 6 damage, or it can crash for 4 while backing up another creature and granting that double strike instead
Flavor Text Ghidorah, King of the Cosmos P/T Number 379 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (4/17/2020) Illuna's last ability exiles the cards face up
Additionally, its a unique and beautiful card that is tied to the lore of Ixalan

Commander Narset of the Ancient Way Creatures Avian Oddity Blisterspit Gremlin Burning Prophet Drannith Healer Drannith Stinger Faerie Vandal Flourishing Fox Glint-Horn Buccaneer Imposing Vantasaur Irencrag Pyromancer Lava Serpent Mad Ratter Prickly Marmoset Rielle, the Everwise Rooting Moloch Sanctuary Smasher Savai Thundermane Sky Theater Strix Snare Tactician Splendor Mare Sprite Dragon Valiant Rescuer Yidaro, Wandering Monster Zirda, the Dawnwaker Noncreature spells Footfall Crater Go for Blood Improbable Alliance Ominous Seas Raking Claws Raugrin Crystal Reconnaissance Mission Reptilian Reflection Shark Typhoon Startling Development Zenith Flare Lands Command Tower Fabled Passage Gateway Plaza Hallowed Fountain Mystic Sanctuary Raugrin Triome Steam Vents Temple of Enlightenment Temple of Epiphany Temple of Triumph 5 Plains 4 Island 5 Mountain Splashing for Cycling One of the things that makes cycling so powerful is that many cycling costs are colorless

That said, it can run both Null Rod and Rule of Law effects (a rarity in this format), is able to run strong cards due to having all five colors, and has one of the strongest single-card wins in the command zone