I was going to suggest some Grixis legend to gain access to stuff like Storm World, Deep Analysis and Mystical Tutor but Mazirek just seems better. Aside from having a commander that cares about sacrifice, getting to play green cards is going to be great for this strategy. Just like the Death Cloud decks from Standard about 12 years ago.
...your opponent's boardstate is never completely knowable, so they could survive a huge annihilator swing...
This is true, but I'm not sure if I like it as an argument. In this thread we do make certain assumptions about the hypothetical opponents' board states. For example, we often implicitly assume that no one has a Moat, Ivory Mask or Null Rod in play. Is assuming that no one has a hate card that hoses the combo safer than assuming that no one has more than ~16 permanents? I don't even know how to start answering that one.
If all creatures have to attack and Kazuul's ability triggers for each creature attacking you, maybe there's some value in handing out creature tokens. Some cards to do that:
If the plan is to make a lot of Ulamogs (four per opponent sounds fair) and mill everyone out in one big attack, then the big payoff creature doesn't have to be Ulamog. It could just as well be Ulamog or Kozilek since annihilator 16 backed up by 40ish power to each player is going get the job done most of the time. If that's not the plan, then, well, I don't know...
What makes Sunforger so powerful is that the cards you have to run to make it worthwhile, i.e cheap utility instants, are cards that you by and large already want to be running. Getting a tutor for utility spells is really strong. Know what's better than Disenchant? Disenchant at the exact right moment to completely blow someone out.
Stuffy Doll is generally pretty good when you're forcing attacks. Manabarbs virtually forces people to attack you and makes the decision on Kazuul's triggered ability all the more difficult for the attacking player.
Cast incubator and copy it with Mirrorworks setting both to Eldrazi. Cast steel, copy it with Mirrorworks, have the original and copy both copy incubator; naming Eldrazi again. Cast Ulamog for 2 and exile two of your opponents' things. Cast herder for 0, process the two things Ulamog just exiled and make 3 Eldrazi Scions. Trigger curio, bouncing Ulamog. Use 2 Scions to cast Ulamog, exile stuff, bounce herder. Basically you exile any even number of permanents and get a 1/1 Eldrazi Scion for each one of them.
You can tell Rob Alexander illustrated a card because he most likely also signed it. If Scott M. Fischer illustrated a card with one humanoid in the art, it bares a striking resemblance to himself.
Given how many awesome and critical enchantments you have, any consideration for Academy Rector? By my count you have 3 ways to sacrifice it and 3 more sweepers that kill it; I'm not exactly sure of whether or not that's enough by my gut says that it is.
Twilight's Call and Rise of the Dark Realms are great so... why no Living Death? Also, Fluctuator seems worth it even though it won't affect some of your cards. And I think Cephalid Sage is the uncommon blue creature you were reaching for when you grabbed Raven Familiar. Maybe a couple of Karoos? They let you fetch or ramp up the bicycle lands, use them for a turn or two, and still get to cycle them.
Ya know, I woke up from a nap thinking the same thing. Ok, then, how about this one:
In play: Urza's Incubator (naming Eldrazi), Sculpting Steel (copying Urza's Incubator, also naming Eldrazi), Cloud Key (naming creature), Eye of Ugin, Cloudstone Curio, Honor-Worn Shaku; In hand: Ulamog, the Ceaseless Hunger, Blight Herder
Same combo as before except now one of the creatures involved needs to be legendary.
I'm going to leave this up here as a reminder that you really should think before posting...
Cast incubator and copy it with Mirrorworks setting both to Eldrazi. Cast steel, copy it with Mirrorworks, have the original and copy both copy incubator; naming Eldrazi again. Cast Ulamog for 2 and exile two of your opponents' things. Cast herder for 0, process the two things Ulamog just exiled and make 3 Eldrazi Scions. Trigger curio, bouncing Ulamog. Use 2 Scions to cast Ulamog, exile stuff, bounce herder. Basically you exile any even number of permanents and get a 1/1 Eldrazi Scion for each one of them.