Swamps 28
Some cards like Flash were banned specifically because of their effects in cEDH, although most of the cards are banned because of their effects on the format in general
It meanders too much to be a serious competitor

Kaza Wizard Tribal Kaza, Roil Chaser | Illustration by Ekaterina Burmak Commander (1) Planeswalkers (2) Kasmina, Enigmatic Mentor Ral, Storm Conduit Creatures (25) Aphetto Alchemist Apprentice Wizard Archmage Emeritus Azami, Lady of Scrolls Cyclone Summoner Docent of Perfection Dualcaster Mage Fatestitcher Goblin Electromancer Guttersnipe Harmonic Prodigy Information Dealer Laboratory Maniac Malevolent Hermit Manaform Hellkite Niv-Mizzet, Parun Nivix Guildmage Overwhelmed Apprentice Riptide Director Siren Stormtamer Stonybrook Banneret Storm-Kiln Artist Triskaidekaphile Veyran, Voice of Duality Vodalian Arcanist Instants (15) Abrade Brainstorm Comet Storm Cyclonic Rift Deflecting Swat Dramatic Reversal Goblin Wizardry Increasing Vengeance Invert // Invent Narset's Reversal Pongify Rapid Hybridization Reality Shift Refuse // Cooperate Swan Song Sorceries (16) Brass's Bounty Crackle with Power Doublecast Epic Experiment Expressive Iteration Expropriate Finale of Promise Finale of Revelation Invoke the Firemind Jaya's Immolating Inferno Mana Geyser Sea Gate Restoration Solve the Equation Soulfire Eruption Step Through Tasha's Hideous Laughter Enchantments (2) Artifacts (6) Arcane Signet Geistflame Reservoir Herald's Horn Isochron Scepter Pyromancer's Goggles Sol Ring Lands (33) Base Camp Desolate Lighthouse Island x13 Maze of Ith Minamo, School at Water's Edge Mountain x13 Mystic Sanctuary Reliquary Tower Shivan Reef I really like this hybrid style between wizard tribal and spellslinger decks

Any card that otherwise renders the horde completely ineffectual is banned
Sorcery - Arcane Color tag templates(None) Rampant Growth Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle