EDH WURRuhan of the Fomori[Primer] | WGR Marath, Will of the Wild | WUG Derevi, Empyrial Tactician | WUB Sharuum, the Hegemon | WBGR Tymna the Weaver / Tana, the Bloodsower | BR Rakdos, Lord of Riots | BUG Sidisi, Brood Tyrant
Constant Mists is a big upgrade over Fog, odds are you're only doing it late game. The buyback seems too much but late game you can usually spare a land or two, and those extra two turns should let a boardwipe come down or hopefully give you the time to get back a good board state. Snakeform, as flavorful and awesome as it is here, seems a little low impact. If you want to stay flavorful, maybe Polymorphist's Jest? It'll even let you get an annoying hexproof creature if the source isn't from equipment.
That also makes me question editing some other cards. Is your heart set on keeping in as many snakes as possible? I know subbing out most of the one drops for some commander staples could be a great idea, but I'm doing something similar with insects and I know I'm keeping in some poor card choices for flavor's sake.
1x Ambush Viper
1x Asceticism
1x Basilisk Collar
1x Beast Within
1x Bind
1x Biomantic Mastery
1x Blue Sun's Zenith
1x Brainstorm
1x Broodbirth Viper
1x Cackling Counterpart
1x Clone
1x Coat of Arms
1x Cobra Trap
1x Coiling Oracle
1x Command Beacon
1x Command Tower
1x Concordant Crossroads
1x Counterspell
1x Cyclonic Rift
1x Cytoshape
1x Death-Hood Cobra
1x Door of Destinies
1x Fabricate
1x Fact or Fiction
1x Fog
9x Forest
1x Garruk Wildspeaker
1x Genesis Wave
1x Green Sun's Zenith
1x Hooded Hydra
9x Island
1x Jace Beleren
1x Kashi-Tribe Elite
1x Kashi-Tribe Reaver
1x Kashi-Tribe Warriors
1x Kodama's Reach
1x Krosan Grip
1x Lorescale Coatl
1x Lotus Cobra
1x Matsu-Tribe Birdstalker
1x Matsu-Tribe Sniper
1x Mirri's Guile
1x Mirror Match
1x Mold Adder
1x Mosswort Bridge
1x Mulldrifter
1x Murkfiend Liege
1x Mystic Snake
1x Nafs Asp
1x Ohran Viper
1x Ophidian
1x Orochi Eggwatcher / Shidako, Broodmistress
1x Orochi Hatchery
1x Orochi Leafcaller
1x Orochi Sustainer
1x Overrun
1x Patagia Viper
1x Plasm Capture
1x Progenitor Mimic
1x Reliquary Tower
1x Rhystic Study
1x Sabertooth Cobra
1x Sachi, Daughter of Seshiro
1x Sakiko, Mother of Summer
1x Sakura-Tribe Elder
1x Sakura-Tribe Springcaller
1x Seedborn Muse
1x Seshiro the Anointed
1x Shisato, Whispering Hunter
1x Simic Growth Chamber
1x Simic Signet
1x Skullwinder
1x Skyshroud Claim
1x Snakeform
1x Sol Ring
1x Sosuke, Son of Seshiro
1x Swiftfoot Boots
1x Sword of the Animist
1x Tangle Asp
1x Thornbite Staff
1x Viridian Longbow
1x Wasteland Viper
1x Winged Coatl
Link to deck @ TappedOut.net
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[Pr] Marath | [Pr] Lovisa | Jodah | Saskia | Najeela | Yisan | Lord Windgrace | Atraxa | Meren | Gisa and Geralf
WUR Ruhan of the Fomori [Primer] | WGR Marath, Will of the Wild | WUG Derevi, Empyrial Tactician | WUB Sharuum, the Hegemon | WBGR Tymna the Weaver / Tana, the Bloodsower | BR Rakdos, Lord of Riots | BUG Sidisi, Brood Tyrant
That also makes me question editing some other cards. Is your heart set on keeping in as many snakes as possible? I know subbing out most of the one drops for some commander staples could be a great idea, but I'm doing something similar with insects and I know I'm keeping in some poor card choices for flavor's sake.
URXSurf's Up, Mizz Magnus!XRU
URGWKynaios and Tiro's Multiplayer MenagerieWGRU