These might not be the best suggestions but Hypersonic Dragon and Talrand, Sky Summoner.

Rite of Replication doesn't do too much most of the time but 6 guttersnipes is pretty funny. Up yours oloro

Two thoughts:

1. No Personal Tutor or Preordain?
2. Pact of Negation doesn't seem that great to me here if only because it doesn't have a CMC, so it can't take advantage of Mizzix of the Izmagnus. It won't get you an extra counter and it won't have its cost reduced...

Oh also, I forgot... I love miracles with Mizzix. More specifically, Reforge the Soul. If you draw into it, it still counts as a 5 CMC spell as far as getting you an experience counter, but it costs way less. Even if you don't draw into it, it's not too hard to cast it at roughly Wheel of Fortune cost.

@Mtg_mill - I'm purposely low on creatures to maximize the possibility of getting spells that will get to the combo pieces, whatever path that may take. Talrand, The Sky Summoner was previously in the deck but him as a win condition takes a whole turn (though sometimes you can go off EOT before yours), and often just sat in my hand while I was racking up experience counters. Having said that, both Talrand and Hypersonic Dragon are solid suggestions for other Mizzix builds.

@UVAFoozle - Rite of Replication is awesome, and my initial build paired it with Dualcaster Mage for some infinite token/copy spell shenanigans, but overall the spell is too inconsistent for me because there's no guarantee you'll have a relevant target. This is another card I agree would be good in other Mizzix builds though.

@saj0219 - Thank you for the Personal Tutor suggestion, I knew I was missing something. There's no Preordain or Reforge the Soul because I'm having trouble cutting cards at this point. Pact of Negation is primarily in here to protect yourself on the turn you're going off with a combo, which is exactly what it did today on a game-winning turn.

Thank you all for the comments and suggestions!

why no FoW? seems much much better than that negate

It is dragonsjet2, but this is a paper deck and it's not in my budget right now. Force of Will, Mana Crypt and Volcanic Island are the big three on that list. Maybe I'll add something to the description about that, given those are significant upgrades for those with access to the cards.

I actually thought Mana Crypt was banned, good to know that its not

+1 to get you to ten up votes, I hate the feeling of being almost there, but not quite :)

No Pyretic Ritual? That card seems very good for this strategy.

@Nightdragon779 - You are a fine person, thanks!

@notdraftthendie - I agree, it's a fine backup to the Desperate Ritual in the deck. Any suggestions as to swaps for Pyretic Ritual?

Pyretic Ritual is cheaper XD

@FeralKitten I think Negate doesn't seem great, as it's not that important to the deck's win condition and you already have a bunch of better counterspells.

I would put Treasure Cruise in here because it almost always gives you an experience counter for 1 mana

@atm0220 You cast Desperate Ritual and chain Reiterate, paying the buyback cost with Mizzix to copy Desperate Ritual. Reiterate resolves first and returns to your hand and a copy of Desperate Ritual is created. then you chain Reiterate to the copy of Desperate Ritual, buying it back again. Repeating this process over and over again netting you 1 red mana each time. Though both Mizzix has to be on the field and you need at least 4 experience counters to do this.