Hi, solid deck list! I've been playing Roon of the Hidden Realm for quite some time, shameless plug for my primer in my signature.
My suggestions would be as follows:
Asceticism is good, but I think you might like Privileged Position even more, as it protects all your permanents, not just your creatures.
Birthing Pod is REALLY good in this deck, and it's cheap now since it was banned in modern - I'd suggest finding a spot for it if you can.
Rhystic Study, Aura Shards, and Sylvan Library are three really powerful enchantments that are also easy on the mana curve. These enchantments will help you get a lot of use out of them, and might be more effective than some of your spells that have a similar effect, like Sphinx's Revelation, Jace Beleran, or a piece of removal.
Your creature curve is pretty high. There are a few smaller casting cost creatures that are pretty good that you might want to consider: Coiling Oracle, Mistmeadow Witch, and Reclamation Sage
You have a lot of planeswalkers. They're fun to play, but they don't last long in multiplayer EDH, and they do not have much synergy with your commander. Some suggestions to replace some of the planewalkers (besides Venser, the Sojourner) are: Spike Weaver, Sower of Temptation, and Ixidron.
Hey thanks for the suggestions, completely missed the Ixidron shenanigans, I was also thinking of taking out Kiora. Even though I really like what she does, I thought she wasn't doing much of anything in this deck. Sowers are impossible to find, I was meaning to get one before I put the decklist up, but haven't been able to find any, also great control synergy. Not huge on Sylvan Library, although a great sifting tool, late game seems pretty moot. Need a Conjurer's Closet & Coiling Oracle though. I'm also looking for a Reveillark
1x Roon of the Hidden Realm
Creatures (27):
1x Acidic Slime
1x Angel of Serenity
1x Avenger of Zendikar
1x Brago, King Eternal
1x Clever Impersonator
1x Consecrated Sphinx
1x Deadeye Navigator
1x Duplicant
1x Eternal Witness
1x Farhaven Elf
1x Gilded Drake
1x Glen Elendra Archmage
1x Karmic Guide
1x Lavinia of the Tenth
1x Perplexing Chimera
1x Phyrexian Metamorph
1x Prime Speaker Zegana
1x Prophet of Kruphix
1x Sakura-Tribe Elder
1x Solemn Simulacrum
1x Sphinx of Uthuun
1x Sun Titan
1x Terastodon
1x Venser, Shaper Savant
1x Vorinclex, Voice of Hunger
1x Wood Elves
1x Woodfall Primus
Planeswalkers (6):
1x Garruk, Primal Hunter
1x Garruk Wildspeaker
1x Jace, Architect of Thought
1x Jace Beleren
1x Kiora, the Crashing Wave
1x Venser, the Sojourner
1x Cloudstone Curio
1x Gilded Lotus
1x Sol Ring
1x Sensei’s Divining Top
Enchantments (2):
1x Asceticism
1x Song of the Dryads
Instants (16):
1x Bant Charm
1x Beast Within
1x Capsize
1x Congregation at Dawn
1x Chord of Calling
1x Cyclonic Rift
1x Harrow
1x Krosan Grip
1x Oblation
1x Pact of Negation
1x Path to Exile
1x Spell Crumple
1x Sphinx's Revelation
1x Summoner's Pact
1x Swords to Plowshares
1x Voidslime
Sorceries (8):
1x Austere Command
1x Farseek
1x Green Sun’s Zenith
1x Hallowed Burial
1x Rite of Replication
1x Supreme Verdict
1x Terminus
1x Wargate
1x Arcane Lighthouse
1x Breeding Pool
1x Celestial Colonnade
1x Command Tower
1x Dryad Arbor
1x Flooded Grove
1x Flooded Strand
1x Glacial Fortress
1x Hallowed Fountain
1x Hinterland Harbor
1x Krosan Verge
1x Maze of Ith
1x Minamo, School at Water’s Edge
1x Myriad Landscape
1x Mystic Gate
1x Reliquary Tower
1x Seaside Citadel
1x Strip Mine
1x Temple Garden
1x Temple of Mystery
1x Temple of the False God
1x Treva’s Ruins
1x Vesuva
1x Windswept Heath
1x Yavimaya Coast
Basic//
3x Plains
4x Island
4x Forest
1x Elvish Visionary
This was just a place to put up a decklist. If you have any cool suggestions I am always open to discuss.
(W/U)(B/R)GForm of Progenitus, Shape of a Scrubland
BRGJund Tokens with Prossh, the Magic Dragon Foil
URGAnimar, the RUG CleanerFoil
RRRFeldon of the Third Path 2.0 Foil
BG(B/G)Not Another Meren DeckFoil
UR(U/R)Mizzix, Y Control and X Burn Spells
(W/U)(B/R)GHarold Ramos - The 35 Foot Long Twinkie (In +1/+1 counters)
UB(U/B)Dragonlord Silumgar
My suggestions would be as follows:
Good luck!
Currently Playing:
Multiplayer EDH Lists (click italics for a link to the thread!)
[Primer] Lord of Tresserhorn - Don't Tell Me What I Can't Do[Primer] Roon of the Hidden Realm - Rhino Blink
5 Color Tribal Guide (Slivers, Atogs, Allies, Spirits)
Also Playing (most decklists can be found on my profile)
MarathGeistKamahlGrenzoBolasThassaGitrog
PiratesZurVial Smasher&ThrasiosYennettJhoira(cEDH)Strix(Pauper)
Legacy: Maverick
Modern:
Melira PodRIP 1/19/15GWHatebears(W/U)(B/R)GForm of Progenitus, Shape of a Scrubland
BRGJund Tokens with Prossh, the Magic Dragon Foil
URGAnimar, the RUG CleanerFoil
RRRFeldon of the Third Path 2.0 Foil
BG(B/G)Not Another Meren DeckFoil
UR(U/R)Mizzix, Y Control and X Burn Spells
(W/U)(B/R)GHarold Ramos - The 35 Foot Long Twinkie (In +1/+1 counters)
UB(U/B)Dragonlord Silumgar
1x Roon of the Hidden Relam
1x Brago, King Eternal
1x Deadeye Navigator
ETB Removal//
1x Acidic Slime
1x Angel of Serenity
1x Duplicant
1x Venser, Shaper Savant
1x Terastodon
1x Woodfall Primus
1x Eternal Witness
1x Karmic Guide
1x Sun Titan
ETB Control//
1x Gilded Drake
1x Lavinia of the Tenth
1x Perplexing Chimera
ETB Ramp//
1x Farhaven Elf
1x Sakura-Tribe Elder
1x Solemn Simulacrum
1x Wood Elves
1x Clever Impersonator
1x Phyrexian Metamorph
ETB Creature Production//
1x Avenger of Zendikar
1x Consecrated Sphinx
1x Prime Speaker Zegana
1x Sphinx of Uthuun
Non-ETB Counter//
1x Glen Elendra Archmage
Non-ETB Ramp//
1x Prophet of Kruphix
1x Vorinclex, Voice of Hunger
1x Cloudstone Curio (Bounce)
1x Venser, the Sojourner
Removal//
1x Bant Charm
1x Beast Within
1x Capsize
1x Krosan Grip
1x Oblation
1x Path to Exile
1x Song of the Dryads
1x Swords to Plowshares
Board Clears//
1x Austere Command
1x Cyclonic Rift
1x Hallowed Burial
1x Supreme Verdict
1x Terminus
1x Pact of Negation
1x Spell Crumple
1x Voidslime
Draw Support//
1x Garruk, Primal Hunter
1x Jace, Architect of Thought
1x Jace Beleren
1x Sensei's Divining Top
1x Sphinx's Revelation (Life Gain)
Protection//
1x Asceticism
1x Kiora, the Crashing Wave
Ramp//
1x Farseek
1x Garruk Wildspeaker
1x Gilded Lotus
1x Harrow
1x Sol Ring
1x Congregation at Dawn
1x Chord of Calling
1x Green Sun's Zenith
1x Summoner's Pact
1x Wargate
Cloning//
1x Rite of Replication
(W/U)(B/R)GForm of Progenitus, Shape of a Scrubland
BRGJund Tokens with Prossh, the Magic Dragon Foil
URGAnimar, the RUG CleanerFoil
RRRFeldon of the Third Path 2.0 Foil
BG(B/G)Not Another Meren DeckFoil
UR(U/R)Mizzix, Y Control and X Burn Spells
(W/U)(B/R)GHarold Ramos - The 35 Foot Long Twinkie (In +1/+1 counters)
UB(U/B)Dragonlord Silumgar