I think 46 lands is too many - maybe 42. Additionally, I think your curve is a little whack at the moment XD haha. I would recommend finding lower CMC utility creatures and curving out to a top curve.

Also, more ways to cheat on high CMC cards. Overload cards are good here - and stuff like Fury of the Horde, which has high CMC but alternative casting cost. Get the most value out of Cascade that you can

Swiftfoot Boots, Lightning Greaves, Champion's Helm and Whispersilk Cloak would all be good cards to protect Yidris

• Kozilek, Butcher of Truth, Ulamog, the Infinite Gyre and Ulamog, the Ceaseless Hunger all work well in making sure you always hit with cascade and if you can somehow cascade into them, would still get their cast triggers.
• Solemn Simulacrum, Coiling Oracle, Sakura-Tribe Elder, Birds of Paradise, Farseek and Deathrite Shaman for color fixing.
• For comboing out; Acidic Slime, Venser, Shaper Savant and Inferno Titan are just a few cards that allow you to win with infinite mana from Deadeye Navigator + Palinchron .

i agree with the above idea... even 42 is way too many lands. you should play more ramp spells that can cascade into stuff rather than lands. im thinking 37. id cut cavern of souls because you dont really have a clear tribe to go with, and then one of each basic. then add stuff that searches for forests because you have shocklands that have the forest subtype.

check out mine here. i took a similar approach to yours. http://tappedout.net/mtg-decks/the-shrekoning-2/