I might cut some lands and Scroll Rack for some early creatures or more creature beats. You've got a lot of mana sources, is that something thats necessary for Maelstrom Wanderer? I've never played him so maybe 50ish is the right number. Are Chaos Warp and Beast Within answers? Answers seem a little off theme for MW but maybe its good to have something just in case. You do have the mass removal spells to cascade into.
1x Maelstrom Wanderer
Creatures (18)
1x Avenger of Zendikar
1x Brutalizer Exarch
1x Consecrated Sphinx
1x Deranged Hermit
1x Eternal Witness
1x Heartless Hidetsugu
1x Hydra Omnivore
1x Inferno Titan
1x Kiki-Jiki, Mirror Breaker
1x Myr Battlesphere
1x Oracle of Mul Daya
1x Palladium Myr
1x Pestermite
1x Primeval Titan
1x Solemn Simulacrum
1x Urabrask the Hidden
1x Wurmcoil Engine
1x Zealous Conscripts
1x Garruk Wildspeaker
1x Jace, the Mind Sculptor
Sorceries (17)
1x Boundless Realms
1x Cultivate
1x Devastation
1x Explosive Vegetation
1x Jokulhaups
1x Knowledge Exploitation
1x Kodama's Reach
1x Mind's Desire
1x Recurring Insight
1x Skyshroud Claim
1x Temporal Mastery
1x Time Spiral
1x Time Warp
1x Tooth and Nail
1x Tunnel Vision
1x Walk the Aeons
1x Wheel of Fortune
1x Beast Within
1x Brainstorm
1x Chaos Warp
1x Mystical Tutor
1x Worldly Tutor
Artifacts (7)
1x Crystal Shard
1x Mana Vault
1x Scroll Rack
1x Sensei's Divining Top
1x Sol Ring
1x Thran Dynamo
1x Worn Powerstone
Enchantments (5)
1x Exploration
1x Mana Flare
1x Overabundance
1x Sylvan Library
1x Warstorm Surge
Lands (45)
45x Land
From the mind of Raymond Swanland: Valla, a plane made entirely out of brownish spikes.
GWUBAtraxa, Praetor's Voice PrimerGWUB
GWURoon Bant Blink WhateverGWU
BRGLord Windgrace LandsBRG