Some thoughts:

• I would be playing Ashen Rider instead of Angel of Despair, as the mana-costs are irrelevant (the games not going long enough to cast either) but exiling instead of destroying is much stronger (particularly as there's a bunch of indestructible cards and lands available).

• Zirda, the Dawnwaker seems very weak/useless here, as for the cost of getting it into play you could have just triggered Necrotic Sliver anyway. Though Necrotic Sliver also feels very slow clumsy regardless of whether there's a cost reduction. Personally I'd be thinking just running 8 creatures, the Ashen Rider and Angel of Despair, would serve you better.

• You need some proactive ways to pitch your high-mana creatures into the graveyard for reanimation. Bone Shards could be good for this purpose, running the full playset of Collective Brutality would also be helpful.

• I'd suggest running a single Unburial Rites so that you can fetch up a reanimation effect in a pinch with Unmarked Grave.

My changes would be something like removing the 4x Necrotic Sliver, 2x Zirda, the Dawnwaker, 2x Inquisition of Kozilek, 2x Unmarked Grave, and 1x Footsteps of the Goryo, and in their place adding in 4x Ashen Rider, 1x Collective Brutality, 1x Persist, 1x Unburial Rites, and 4x Bone Shards

I love this draw odds calculator but it could definitely do with a lot of improvements, giving a lot of room for a better tool to squeeze in and take its place.

It’s issues namely are:

• can be a bit scary for newer players that need it most.

• can be quite finicky if you’re trying to calculate more advanced odds - like the odds of drawing an actual keepable hand given a range of criteria.

• it would be nice to have “odds to find x buy turn y”, taking into account cards in a deck that can draw/scry/surveil/search etc.

• it would be nice to have odds of hitting X lands on-curve, in a more visual and representable way than the current finicky approach.

If you’re super worried about just Chalice of the Void then Volt Charge might be worth considering. The mana cost is a bit high, but it lets you inflict damage while also ticking any Chalices up to X=2, which simultaneously prevents anyone casting any future X=1 Chalices, while also potentially messing with the opponents own gameplans.

Might be a bit too cute to be useful, but if Chalice is the #1 threat to the deck, it could be a good sideboard choice.

Some thoughts:

• You’re running waay too many cards as 1-ofs and 2-ofs. This will lead to the deck being super inconsistent and make it really hard to present a coherent gameplan. The vast majority of your deck should be playsets (4-ofs). A good approach for new deck builders is to pick 9 cards and run playsets of each of those alongside 24 lands, for a 60 card deck.

• Your mana curve is too high at the moment. Most decks can’t justify running more than 4 cards costing 4-or-more mana, your deck has a whopping 10, which is insanely high. It means most of your turns will be super slow/clumsy. Going from the previous suggestion of picking 9 cards, you should aim for those cards to have a mana curve something like 1,1,1,2,2,2,3,3,4.

Some thoughts

• Y ou’re running waay too many cards as 1-ofs and 2-ofs. This will lead to the deck being super inconsistent and make it really hard to present a coherent gameplan. The vast majority of your deck should be playsets (4-ofs). A good approach for new deck builders is to pick 9 cards and run playsets of each of those alongside 24 lands, for a 60 card deck.

• Your mana curve is too high at the moment. Most decks can’t justify running more than 4 cards costing 4-or-more mana, your deck has a whopping 15, which is insanely high. It means most of your turns will be super slow/clumsy. This is made even worse by your deck having almost nothing to do on turn-1, which means you’re almost always a turn behind your opponent. Going from the previous suggestion of picking 9 cards, you should aim for those cards to have a mana curve something like 1,1,1,2,2,2,3,3,4.

• I think you need to work out what you want your deck to do, and focus more heavily on that theme. Cards work better when they synergise with other cards in your deck.

Nemata, Primeval Warden is replacing the ability for a creature to die with it being exiled instead. As such, no death triggers ever happen (because nothing actually dies, its getting exiled), so Myrkul, Lord of Bones ability never gets a chance to trigger.

I think you should at least replace Lotus Field with a regular land, because as-is it’s going to be a dead card in your hand a lot of the time

Edit: i’ve only just seen the update come through now… disregard this comment.

Butterking i think the Umori restriction is hurting you waaay more than its helping you.

Some thoughts:

• Neither Ancient Copper Dragon nor Seething Song are Modern legal.

• Your mana curve is waaay too high, and i don’t think your limited treasure-production or cost-reducers come close to justifying it. Decks typically can’t run more than 4 cards costing 4-or-more mana without becoming extremely slow and clumsy… you’ve got a whopping 24 cards in this mana range, which makes this deck feel unplayable.

• 20 lands is super low even for a deck with a medium/standard mana curve. Even after you drastically lower your mana curve, i suspect you’ll still need to go up to 23-24ish lands minimum.

Some thoughts:

• 85 cards is waaay more than you should be running. It will lead your deck to being much less consistent, and much weaker. You should always be aiming to get your deck down to 60 cards.

• Your land count is way too low. 28 lands in a 85 card deck equates to only 20 lands in a 60 card deck. For reference, burn decks run 20 lands and only play cards costing 1-2 mana (and are happy being stuck on 1 land fir a few turns). For what you’re trying to do I think you need at least 23 lands in a 60 card deck (that’s 33 in an 85 card deck).

• you’re running waay too many cards as 1-ofs and 2-ofs. This will lead to the deck being super inconsistent and make it really hard to present a coherent gameplan. The vast majority if your deck should be playsets (4-ofs). A good approach for new deck builders is to pick 9 cards and run playsets of each of those alongside 24 lands, for a 60 card deck.

12 lands feels insanely low - especially as 4 of them are useless unless you already have 2 other lands in play.

I don’t see how you’re ever realistically getting more than 1 land in a game (you only have 23% odds of starting with 2 playable lands in hand), and i don’t see how you’re realistically resolving any of your mana rocks without the mana to cast them (yes you have Lotus Bloom but that mana isn’t available until turn 4, and is one-off).

I think you also need to drastically lower your mana curve (you have 14-16 cards costing 4-or-more mana when decks typically can’t justify more than 4).

Some thoughts:

• 97 cards is waaay more than you should be running. It will lead your deck to being much less consistent, and much weaker. You should always be aiming to get your deck down to 60 cards.

• Your land count is way too low. 29 lands in a 97 card deck equates to only 19 lands in a 60 card deck. Fir reference, burn decks run 20 lands and only play cards costing 1-2 mana (and are happy being stuck on 1 land fir a few turns). For what you’re trying to do I think you need at least 24 lands in a 60 card deck (that’s 36 in a 97 card deck).

• Your mana curve is too high at the moment. Most decks can’t justify running more than 4 cards costing 4-or-more mana, your deck has a whopping 27 (18 if we scale it to 60 cards), which is insanely high. It means most of your turns will be super slow/clumsy.

• A lot of these cards have strictly better versions you should be running. For instance, Lightning Bolt is a strictly better version of Shock, and so there is never any reason to be running Shock in a deck.

Neither Throne of Eldraine nor Oppression are Modern-legal.

I think you’re running too many cards as 1-ofs and 2-ofs, which will lead to consistency issues. You should aim for the vast majprity of a deck being playsets of cards (4-ofs).

I think you should go up to 23 lands

I like this concept a lot, and from the look of the list it feels very easy to assemble.

My only thought is that there has to be more obnoxious permanents to cast for 5 mana… you’re not restricted by colour so you can just put any egregious nonsense into play pretty easily. Imo Titania, Protector of Argoth is only really any good in a deck running fetchlands.

I had a quick look through gatherer and the following might be worth considering:

• Demigod of Revenge is hyper aggressive and can mess with your opponents ability to kill your board.

• Fury (and maybe Solitude) feels like a solid ways to apply pressure and mess with the opponent.

• Doom Whisperer rigs your deck so that are always drawing gas. It also works great with the before-mentioned Demigod of Revenge.

• Dragonlord Ojutai is a resilient threat if you’re local meta has a lot of killspells.

• Garruk, Primal Hunter wins most grindy games just through being a value engine. In a similar vein Teferi, Hero of Dominaria can provide you a lot of advantage if you can keep it alive.

• Glorybringer is stronk but might not be stronk enough for the effort to get him into play

• Sheoldred  ^Flip probably auto-wins by itself if you can flip her

• Keruga, the Macrosage draws you all the cards.

I like the concept. My big concern is that 20 lands feels really low for either strategy - I’d suggest going up to at least 23.

Intangible Virtue isn’t really doing much for you, so i’d be dropping those for lands.

Outside of that i’d suggest swapping Chart a Course and Sleight of Hand for Preordain and Opt.

This us the kindof list i’d end up building (again, Green-Blue, but it’d be super-easy to make this mono-green)

• 4x Hydroid Krasis
• 4x The Goose Mother
• 4x Ice-Fang Coatl
• 4x Mistcutter Hydra
• 4x Voracious Hydra
• 2x Kalonian Hydra
• 2x Gargos, Vicious Watcher
• 4x Unbound Flourishing
• 4x Utopia Sprawl
• 4x Noble Hierarch
• 4x Birds of Paradise
• 4x Prismatic Vista
• 2x Snow-Covered Island
• 14x Snow-Covered Forest

Without a ceiling for your budget there’s a lot of options.

Seth made this list last year which is very hydra themed, and likely to play pretty closely to how you’re wanting, by making riddiculously sized hydras.

Personally i’d be going down the route of playing Green with a splash of Blue, to run Hydroid Krasis and The Goose Mother. Using the established Prime-Titan deck as a base, you could drop The One Ring and Primeval Titan for those Krasis and Goose mother, and still have a very viable/competitive brew (you could also very reasonably drop Cultivator Colossus and Summoner's Pact for more hydras also).

What’s your budget? I assume you want to stay mono-green?

Metroid_Hybrid - note that 9~11 years is still an insanely long time in terms of game development and evolution. Colour-pie philosophies will have evolved, adapted, and changed multiple times-over between then and now.

9~11 years is still very old - just maybe not as a percentage of the games total lifespan. I think FormOverFunctions point isn't invalid at all - if either of these cards were printed today they could very easily be WR or even BWR

Red has a lot of insane “chaos” effects that mess with the entire boardstate, restricted to just being at extremely high mana costs, and i’d say that these both fall into that bucket. You would never see this kind of stuff at lower mana costs for red, but these cards still squarely fit into the red colour pie for what they’re currently doing imo. Note red has a LOT of old cards doing chaotic stuff like this.

Note also that both of these cards are very old now, and I don’t think either would be printed into a standard-legal set today (imo mainly due to the global-land destruction). I think the types of chaos effects red implements these days are less destructive, and less self-damaging. That’s not to say that red can’t do these kinds of effects at high-cmc, but more that wizards has just soured on how these interactions play-out on the board.