Green Dragons breath poison gas, so Green Dragons ability makes perfect sense
For all this early game control and security it is not a dead card late game, just a little weaker than in the early game

Arcane Maelstrom Commander (1) Planeswalker (1) Creatures (21) Nascent Metamorph Dualcaster Mage Glademuse Haldan, Avid Arcanist Crackling Drake Eon Frolicker Lunar Mystic Murmuring Mystic Niblis of Frost Rashmi, Eternities Crafter Solemn Simulacrum Talrand, Sky Summoner Goblin Dark-Dwellers Pako, Arcane Retriever Xyris, the Writhing Storm Charmbreaker Devils Etali, Primal Storm Melek, Izzet Paragon Wort, the Raidmother Djinn Illuminatus Ravenous Gigantotherium Instants (24) Crop Rotation Artifact Mutation Comet Storm Commune with Lava Evolution Charm Starstorm Strength of the Tajuru Tribute to the Wild Chaos Warp Decoy Gambit Deflecting Swat Frantic Search Harrow Hunter's Insight Natural Connection Temur Charm Channeled Force Chemister's Insight Curious Herd Slice in Twain Clash of Titans Prophetic Bolt Whiplash Trap Hunting Pack Sorcery (1) Enchantments (6) Primal Empathy Psychic Impetus Shiny Impetus Wilderness Reclamation Predatory Impetus Swarm Intelligence Artifacts (7) Sol Ring Arcane Signet Lightning Greaves Bonder's Ornament Commander's Sphere Twinning Staff Lavabrink Floodgates Lands (38) Cinder Glade Command Tower Desolate Lighthouse Exotic Orchard Frontier Bivouac Gruul Turf Halimar Depths Izzet Boilerworks Kessig Wolf Run Mossfire Valley Mosswort Bridge Myriad Landscape Oran-Rief, the Vastwood Rugged Highlands Rupture Spire Scavenger Grounds Simic Growth Chamber Swiftwater Cliffs Thornwood Falls Yavimaya Coast Forest x8 Island x5 Mountain x5 Commander, Theme, and Strategy Kalamax loves a good storm, and what better way to create a storm than with instants

To combine this experience with the cool deckbuilding constraints and hijinks of Commander, you can even build a Commander Cube
Retrieved April 23, 2020
Meowth takes 20 additional damage from Fighting-type attacks