I'd definitely run Maelstrom Wanderer in here - Give Ydris double strike, Strionic Resonator one of the triggers, then cast Wanderer, cascade five times? Seems good. Might also be worth trying out Arjun, the Shifting Flame, since he'll keep you wheeling through your deck to find the cards you need as you try to combo off.

Meanwhile, it doesn't look like you've got anything to use on Zada, Hedron Grinder or Mirrorwing Dragon except Chaos Warp and Bituminous Blast. There's no reason to be running these at all. If you're counting on storming off with Aetherflux Reservoir, they don't help you, since you don't cast the new spells. You don't even get extra cascades off Bituminous Blast, since you have to cast the spell to trigger cascade. I'd cut both creatures.

Nice Deck, here are some other cards to consider. In my opinion, you need to add some more complimentary cards to help Yidris out even more. He's so fun when he's broken.

Creatures: Courser of Kruphix, Kederekt Leviathan, Peregrine Drake, Torrent Elemental.

Artifacts: Fireshrieker, Mask of Riddles, Prowler's Helm, Trailblazer's Boots.

Enchantments: Bear Umbra, Mark of Fury, Nature's Will, Temur Ascendancy.

Spells: Snap, Rude Awakening, Tendrils of Agony, Artful Dodge.

Lands: Hanweir Battlements, Rogue's Passage

Check out my Yidris deck if you want Pouring like an Avalanche coming down the Mt

Love Yidris! But I realized myself that when playing him he normally is the first target of EVERY removal spell. So I began to try to protect him as much as I can. In Yidris' color combination are a ton of cards that can give you additional protection like:

Vexing Shusher: Can't be countered AND protects every spell you cast. Totally awesome!

Swiftfoot Boots: I know that not everyone is a fan of Lightning Greaves since they are not allowing you to enchant Yidris yourself..but the boots are totally fine!

Asceticism: Is also a perfect card to offer some protection even if they get lethal damage.

Now for card draw. One problem with Yidris is that he's only good if you have enough cards in hand. Therefor I'd recommend Jori En, Ruin Diver since she ALWAYS triggers when you cast a cascade spell. Also Rhystic Study is something I wouldn't underestimate. Of course you don't want ALL your cards in hand but at least a decent variety of possible next spells.

Hopefully, that helps!

ScrOuch -

Thanks for the suggestions. Vexing Shusher is for sure going onto my shortlist, I completely forgot about that card. I might add the boots, but I already have two pieces of protection that I would consider better than it. However, it might be able to go in due to the lower mana cost.

Unfortunately, I will not be adding Asceticism strictly because it costs too much mana and I am trying to lower the curve. As for draw options, I am leaning more towards wheel effects because the deck already has lots of wheel support (also might try to make the deck work without Yidris), and while Jori is nice, she only draws you an extra card each turn.