Redeeming the improbables - How mechanics could return

{Example cards}

{Card critique and a deck tech}
It doesn't seem wildly powerful, but it's maybe a bit under-costed (I'd put it at a CMC of 4. I'd want to give it access to a third color: green, since it's a CMC matters commander, it needs access to the biggest bombs and the best ramp smooth out the necessarily trixy-wacky curve and because this card's mechanical identity just feels more gruul+blue to me than izzet.

The first ability is a conditional Notion Thief that punishes you as it turns off when you lose a clash for this ability; The second ability is an Erayo's Essence that hits the second spell cast each turn (and is therefore much less unfun), that again has a clapback for losing the clash. It rewards you for being able to consistently control the top of each players library and punishes you if you fail to do so. A reasonable balance of abilities until someone tries and succeeds in breaking it. At first glance this lends well to control or prison, but the problem with that is it let's your opponent's first spell through no matter what. For this reason I'm reading it as a card that wants to slow down your opponent just enough to get to a mid-game so it's high CMC strategy can take off; for that reason, I'm teching a Temur Stompy deck.

First, we have to make sure your commander's doing good things for you, meaning we need to make sure your winning clashes.

Foresee, Nissa's Revelation, Ugin's Insight give you large once off scrys.
Jace, Mirror Mage, Psychic Impetus, and Prognostic Sphinx give you the ability to repeatedly scry 2 or more.
Spin into Myth and Jace, the Mind Sculpter effectively let you fate seal.
Nulltread Gargantuan lets you put one of your big permanents on top of your library either to win a clash or retrigger its etb.

To have a good chance of winning clashes, even without your deck sculpting cards, you need high CMC cards in the deck. But we don't actually want to cast them for that CMC.

The first way to cost cards for less than their CMC is to have cards with deceptively high CMCs: twobrid cards are the first of cards that do these, but unfortunately, only Tower Above really fits into the deck strategy; so we'll be including more split cards, whose CMC when not on the stack is equal to the sum of both halves: Armed||Dangerous(2+4=6), Insult||Injury(3+3=6), Mouth|Feed(3+4=7) Reason||Believe(1+5=6), Spring||Mind (3+3=6), Struggle||Survive(3+2=5), then there are cards with much lower alternative costs like Deep-Sea Kraken and Greater Gargadon; and last are cards that reduce their own cost like Ghalta, Primal Hunger, Icebreaker Kraken, and The Great Henge.

The second strategy is skip on the full casting cost is to reduce the cost of spells: Goreclaw, Terror of Qal Sisma, Rhonas's Monument do this while making creature big and trample-y and Thryx, the Sudden Storm also makes big creatures uncounterable.
And the third option is to cheat them in witout paying for them: Court of Bounty, Eldritch Evolution, Reason||Believe, Rashmi, Eternities Crafter, and Vivien, Monsters' Advocate.

After making sure we're winning clashes, we have to make good use of that fact.
The first ability makes it so that symetric draw engines like Font of Mythos, Reforge the Soul, and Rights of Flourishing slant in your favor and cards like Barbed Shocker and Xyris, the Writhing Storm become stronger for similar reasons.
Word of War and Words of Wilding both let you spend a mana to turn the draw from your commander into another effect allowing you to keep a clash winning card on top to prevent multiple extra draws.
And for second ability Guile will let you cast any spells you counter.

High CMC cards are strong, but why not make them stronger with Battle of Frost and Fire and Imoti, Celebrant of Bounty.
While your at it, hose your opponents smaller spells with Ugin, the Spirit Dragon.

Neheb, Dreadhorde Champion pulls double duty as a card filter and mana ramp. Song of Creation also fills both these roles as well as as a mana ramp.
Spellbound Dragon and Wolf of Devil's Breach both let you turn dead High CMC cards in your hand into damage.

In addition to Court of Bounty, I'm including the monarch cards Azure Fleet Admiral, Court of Ire, and Regal Behemoth. (Also Throne of the High City, but that's a land.)
Mutate Cards let you turn your relatively small commander into a threat; Auspicious Starrix, Dreamtail Heron, Illuna, Apex of Wishes, Migratory Great Horn, Parcelbeast (is here for it's activated ability).

For ramp the land fetching spells Cultivate, Spring||Mind, Rights of Flourishing, Verdant Confluence, and the mana doublers Mana Flare, Overabundence, Vorinclex, Voice of Hunger, Zhur-Taa Ancient. 
Radha, Heart of Keld let you play lands from the top of you library to clean up your draws and clashes. Coveted Jewel and Nyx Lotus are strong mana rocks in the deck's theme.

Mana sinks Genesis Wave, Hour Of Eternity, and Mass Manipulation give you places to spend excess mana.

And lastly miscelanious spells: Toski, Bearer of Secrets, Craterhoof Cehemoth, Beastmaster Ascension, Yidaro, Wandering Monster, Bow of Nylea.

Landbase is whatever, but it will include Akoum Warrior, Bala Ged Recovery, Glasspool Mimic, Kazandu Mammoth, Kazuul's Fury, Khalni Ambush, and Sea Gate Restoration, Song-Mad Treachery, Turntimber Symbiosis, Umara Wizard, and Valakut Awakening as bonus spells with a 3+ CMC, and Faceless Haven, Throne of the High City, Opal Palace, and Reliquary Tower for their effects.

Companion: Because I might as well, Keruga, the Macrosage. If you don't want to use Keruga, you could probably find slots for lower CMC spells like Scroll Rack, and Ponder to help sculpt your top deck. Nissa, Steward of the Elements, Displacement Wave, Electrodominance, Finale of Devastation, Finale of Revalation, and Kamahl's Druidic Vow were X spells cut for their CMC of 2. Ediolon of the Great Revel and Pyrostatic Pillar will do a lot more harm to players running sol ring etc than they will to you.

You'd probably also want to find ways to make room in the deck for clash matters cards... but meh. I barely managed to cut the list this short (it's always harder to cut spells).