I honestly think that Mazirek, Kraul Death Priest and Izoni, Thousand-Eyed are a match made in heaven. I think that any deck that features one, should feature the other too. Heck, Mazirek can sub as a commander in this type of deck. Additionally, I think Gruesome Menagerie will work great here - you have an abundance of several 1 and 2 drops.

Seems a good start but this type of decks need more creatures. 35 at least but I prefer 38-40. With 27 the Undergrowth won't be as good as it could be

VanguardVII, thanks for your feedback. I have been slowly increasing the creature count but I agree that I want it higher. I have a hard time decided what non-creature spells to cut though. Any suggestions?

MegaMatt13 Sure, my suggestions would be to cut Golgari Signet, Awakening Zone, Necrogenesis, Pernicious Deed, Saproling Symbiosis, Altar's Reap, Costly Plunder, Grapple with the Past, Grisly Salvage, Regrowth, Kodama's Reach and Cultivate. You can add more creatures with ETB to destroy artifacts or enchantments, creatures that mills you like Stitcher's Supplier and Glowspore Shaman, creatures to draw more like Bloodgift Demon, creatures to ramp like District Guide (this is kinda bad but you can find better ones) and I suggested both Cultivate and Kodama's Reach because you can add Harrow and take advantage by adding World Shaper and Ramunap Excavator . I hope this helps.

VanguardVII, thanks for your great suggestions. I've incorporated some and will continue to try out others as I pick up the cards (I need a world shaper and Ramunap excavator). Up to 34 creatures now and I'll probably go a bit higher.

MegaMatt13 You're welcome, I'm still building mine, maybe when its finished you can take some ideas from there as well. One more suggestion that came to my mind later: Burnished Hart for ramp and of course Mazirek, Kraul Death Priest his synergy with Izoni is absurd. Oh, and Golgari Grave-Troll best dredge.

What about Panharmonicon to abuse etb effects like your commander and avenger?

Tortured Existence is great in decks that want to put a lot of creatures into the graveyard and is also great with Dredge creatures. Drdge 5 with Stinkweed Imp, pay B to pitch Imp back into the graveyard, returning a creature of your choice back to hand, and do it again next turn.

Evolutionary Leap would do a lot of work here. It's an additional sac outlet to fit your decks Aristocrat strategy and allows you to upgrade your tokens into bigger/better creatures. You can also sac creatures with useful etb effects so that you can utilize them again later.

Meren of Clan Nel Toth would be a great addition as well. She recurs your etb creatures as well as generates value in the form of experience counters when you sacrifice creatures.

Birthing Pod is one of the greatest Green sacrifice cards ever printed. It does require you to build your creature base in a way that is designed to take advantage of it, however. To truly utilize Pod you would have to tinker with you creature base a bit. Not a lot, but a bit.

Veteran Explorer also benefits your opponents which is usually my number one reason for omitting it from decks, but it is a cheap (1 CMC) powerful card that fits into the archetype really well.

I'm not sure what your budget is like, but Vampiric Tutor and Demonic Tutor are both immensely powerful cards, as is Craterhoof Behemoth. I know the deck wants to Aristocrat, but you have a lot of token making potential, having a single overrun effect in the deck would be useful. The fact that Craterhoof is a creature for Undergrowth as well as Pod, should you choose to add it is a big deal. You can Pod chain Izoni, into Avenger, into Craterhoof to win, for example.

Costly Plunder and Altar's Reap fit the theme, but still seem quite weak. If you need the extra card draw, I would swap them out for Phyrexian Arena and Deathreap Ritual, which are more consistent and will draw you more cards over time.

I would also try to find room for Grave Pact and/or Dictate of Erebos, which are staples in any self-sac strategy.

This list makes me want to turn my Meren deck into an Izoni deck. +1.

I love the idea of building around Izoni, and this looks like a nice start. Its is really creature heavy, and I'm not sure you need as many as you think to make her work well, but the more you play it, the more you'll figure that out. +1.

duff87, yeah...Izoni draws significantly less hate than Meren while still having the dredging graveyard feel. I'd describe her as a "fairer" Meren.

bushido_man96, thanks for your feedback. You're right that I'm slowly figuring out how many creatures I need. I started with about 27 and that was definitely too low. 40 may be a bit too high. I'll probably settle in on 35-38 when I figure out which creatures aren't great performers.

duff87, yeah...Izoni draws significantly less hate than Meren while still having the dredging graveyard feel. I'd describe her as a "fairer" Meren.

bushido_man96, thanks for your feedback. You're right that I'm slowly figuring out how many creatures I need. I started with about 27 and that was definitely too low. 40 may be a bit too high. I'll probably settle in on 35-38 when I figure out which creatures aren't great performers.

Why aren’t you running Sol Ring? I didn’t see any Null Rod type effects so there’s no reason not to run it.

It looks to me like you need to have more creatures that want or need to be in your graveyard, but you only have a few that really want to be there. Look at switching in some cards like Brawn and Filth, especially since you're running Urborg, Tomb of Yawgmoth. That could win you a game right there. I second running Tortured Existence and Evolutionary Leap. Yavimaya Elder and Burnished Hart should probably be included, too. Both want to die, both have built-in ways to kill them, and both get you lands. I'd recommend replacing cards like Wood Elves with Llanowar Elves and Elvish Mystic. They help your curve out more, and are good sac fodder later on.

TheGeneralAdvisor, Sol Ring is banned in my playgroup so you won't see it in any of my decks. Of course it's a great addition if your group allows it :)

bushido_man96, Evolutionary Leap is already in there :) I temporarily took out Yavimaya Elder to make room but have put him back in. I've added Tortured Existence to the maybelist. I don't own a copy but certainly see how it would be good. I would consider Brawn and Filth if my main strategy was swinging in for an alpha strike. This really is more of an aristocrat life drain deck though. Sometimes I go an entire game without turning a creature sideways to attack. Really appreciate the suggestions!

MegaMatt13, I gotcha. If you find yourself in need of an alternate wincon (from a player who does something silly like gain infinite life or something), the commander damage rule doesn't care about how high the life total is. Just a thought, though.

I do have a question for you: why would a group ban Sol Ring? Its a great card and all, but if its so ubiquitous, then why ban it?

Here are some suggestions that might help:

Kessig Cagebreakers, Stinkweed Imp, Whisper, Blood Liturgist, Pawn of Ulamog, Grim Haruspex, Dance of the Dead, Necromancy, Entomb.

Hope those help!

Sheoldred the Whispering One is an absolute beast in sac decks. Expensive cmc though but worth considering in my opinion.

Hell's Caretaker and Archfiend of Depravity are great suggestions in sac decks too.

I see no scenario where Meren of Clan Nel Toth is not a better commander for this deck.

ZendikariWol, I agree. When I first saw Izoni, I really thought she would be fun to build around. But the more I see her around, I think her ability works better when she can enter the battlefield over and over again. She will work very well with Meren in providing both card draw, sac fodder, and a sac outlet.

ZendikariWol and bushido_man96, I agree that Meren makes for a more powerful commander of a dredge-themed deck...hence her popularity. At least in my playgroup, she is also a massive target of hate from other players. The Meren player usually gets targeted first. I guess it depends on the dynamics and power level of your group. I've purposely avoided building a Meren deck and opted for a less powerful, but still perfectly respectable, commander. I typically only cast her once per game after I have an aristocrat or two and a lot of creatures in my grave. As a 6 CMC commander I typically don't find it worthwhile to cast her more than once when I am trying to close out the game. Her main purpose is to provide an army of tokens to help drain out opponents. Occasionally I will cast her for her card draw ability if I am running out of gas. Hope this helps explain the thought process!

I get that, making a meta adjustment to play the same or similar deck. The only drawback Izoni has is her prohibitive mana cost. But I've no doubt that with the proper tweaking, she can run really smoothly.

Very nice, I like this one. I've build an Izoni-deck on my own and it is very nice to compare things. Maybe consider Grim Feast or Dross Harvester for some life gain. For sure someone recommended Grave Pact ...

Check out my version of Izoni in Underrealm EDH