ReaperAndross

As TheSwarmer mentioned, with Urza's Saga it specifically looks for that mana cost of [0] or [1] in the top corner. It's not a straight CMC 0 search. This makes it better at looking for something like Mishra's Bauble to trigger Delirium, since Urza's Saga covers both Enchantment AND Land, or finding something like Zabaz to do some funky counter stuff.

I get that you're trying to ramp out into hefty creature-based boards, but Modern is a game built on 1 and 2-drop cards now.

Bloodline Keeper is just too slow in this deck. Not only is it a 4-drop, but you also have to wait a turn to make a 2/2 that can't even do anything that turn.
There is also the issue of the fact that you have ZERO removal outside of chump blockers, and I don't see you making enough tokens to deal with a Murktide Regent or an Eldrazi Titan if a Tron player gets them out.
I do believe that you are also going too hard into those Planeswalkers, especially with how the Legend rule works with them. Even though they are a consistent source of tokens for you, they are just too slow for what you want. And the Gideon is just not worth it in Modern. I'd run 3, maybe 4, of the Sorin because he's actually pretty decent, but only 2 Elspeth unless you go super hard into those 3-drops or smaller.

Cards like Doomed Traveler have been a staple in token decks for a decade for a reason, so it might be worth considering options like that or Blood Artist to get more drain in.

Yeah. Cheapest version that my local store has is 14.40 Aus, so goes a little against the Budget part of the deck, but is actually a good card to add in the future!

Mate, I am what people could classify as a Phyrexian simp, and I am more disappointed than anyone else at what happened.

As for why I thought of using Mirrodin over Fatal is that Mirrodin draws me a card, and that's the one most fatal flaw I see with this deck, and that's just spewing out a hand and playing the topdeck game. It is also why I have Stronghold Arena in here, and I would have run Dark Tutelage instead because that's just do it in upkeep, but is a 3-drop and so I believe too slow for this type of deck.
That being said, I think it's still a good idea for the sideboard!

The Boulder feels conflicted about fighting a young, blind girl.

I'd aim for more sac-lands if possible. Despite them not fitting your colours completely, adding in Riveteers' Overlook and the Brokers one would go a long way towards getting more of those Landfall triggers. Same goes for regular Fetchlands too, like Arid Mesa.
A card to play lands from your graveyard would also be a good option for this deck then too, as you can activate those searches more.

MAJOR UPDATE:
Now that Fury is banned in Modern, and playtesting, I've done some slight modifications to this deck:

-1 Ashiok, Wicked Manipulator
+1 Swamp
-2 Leyline of the Void
+2 Dauthi Voidwalker in sideboard

2 Leyline of the Void moved to sideboard
1 Damn moved to sideboard
3 Sheoldred, the Apocalypse moved to mainboard
2 Unlicenced Hearse moved to mainboard
*Fetchlands to be added when I find which ones I have

Basically 21 lands felt like SLIGHTLY too little, and with Ashiok being a 5-drop, one copy was cut. Also since a scammed Grief is an absolute beatstick.
Leyline shouldn't be as necessary anymore since Scam style decks should be out. Hearse is a welcome replacement instead to help deal with graveyard decks mainboard, such as Murktide and Yawgmoth.
Sheoldred is now in main because one thing that this deck can suffer from is how quickly you can pay life before Ashiok hits the field with cards like Dismember, Street Wraith and the Fetchlands. She's also a fantastic beatstick of a creature and removal/counterspell bait.
Dauthi is also going into the sideboard in case of more graveyard decks, while having a use outside of Leyline's starting in an opening hand, and a possible tech choice to steal a good card from opponents.

While the search is great on Urza's Saga, it only tapping for colourless and the token being useless, in a deck with such heavy pip requirements for how low the actual land count is. And it only searches out a Mishra's Bauble mainboard. I admit that filtering out the deck is part of the gameplan for a deck like this, but Saga is a little too specific in what it does to slot in here.
And yeah, it does help find the Tormod's Crypt, but that's a very specific scenario that I'd need, and there are a lot of situations where I see myself searching for it with the Saga the turn after an opponent Delves into a Murktide or has already scammed me out of my hand.

Mutktide is the most obvious answer. Other than that, it's arguable that either Fury or Subtlety were cut since I see them a lot in the deck lists for Murktide.

But I wouldn't say that anything was necessarily cut. I added the Kiki/Exarch combo first, then looked at a couple of Murktide decks and went off my experience versing them, and just added their greatest hits like Expressive Iteration, Mishra's Bauble and DRC. Kept going until the deck was done! Well, I was kinda stuck towards the end until I remembered that Preordain got unbanned and is a Sorcery, so better chances getting Delerium instead of going with Brainstorm.

Part of the reason that I decided to go with Grief in that deck though, is that the Evoke cost is actually an advantage to me, considering Ashiok is the endgame and requires my own cards in exile.
As for Gutshot, I don't own any. And my local doesn't have any either.

Painter's Servant could be an interesting colour-hate deck, if you can find a way to consistently keep it alive and avoid cards like Fury. But there are quite a few white decks that just run cards like Paladin En-Vec to just avoid them.

Yeah, this game is incredibly busted. Not according to WotC though, since we all saw the last banlist (or lack there-of) recently.

But this is why I am trying to make a deck specifically designed to spite the main types of decks being played and largely exploited in Modern currently. I haven't got all the cards, or time, to test it all out, but the theory is there for now. That being said, I could always use some advice when attempting this sort of thing.
https://www.mtgvault.com/reaperandross/decks/delving-into-nightmares/

With how I roll for my Warp Lightning Cannons? That's a good one.
If any of them make it past turn 2, then it's a good game for them. And out of the 20 I've used, about 3 have been taken out by enemies.

Only free spell that I see regularly is Mishra's Bauble, but that is mainly in Murktide decks because of how easy it is to proc Delirium with for cards like Dragon's Rage Channeller. Most of the cards I see these days are 1-3 drops. Or have ways of being cheated in, like Foothills Cascade.
There is also the Beanstalk deck that plays a lot of big cards, but that also has heaps of ramp.

That's a good question! I think the thing is with the Leyline cards is that for them to be effective against cards like Grief with how fast Modern is, they have to be in your opening hand, and people aren't willing to mulligan down to find an out that MAY help them against a deck. The Leyline cards being 4-drops in a format ruled by 1-3 drop cards, or ways to cheat out bigger cost cards, is also a liability for some people considering they are essentially defensive passives. Leyline of Sanctity is also white, which is the least played colour in Modern if the stats I've seen are anything to go by.
A lot of my "Sample hands" that I would keep don't even have LotV in hand, because the Scam element is just too strong to pass up. Exiling a Tombstalker to double-Grief turn one seems potent enough to hold onto, even if there is the chance of being hit by the same sort of play.

I also don't recall a lot of cards that can be played from exile, and the ones I do have a hefty cost, such as Skaab Ruinator requiring 3 creatures in grave to exile, or a sphinx with a very high mana cost.

I'm also unfamiliar with the counterspell you have mentioned here. It does seem a bit niche unless cards like Force of Will or Force of Negation are everywhere too amongst blue decks.

I think that nobody owns the borderposts and it's the fact that they enter tapped, while setting you back on a land drop. I do have the red/black one (Veinfire?) and use it in my Obosh deck. It isn't a terrible card in there, but doesn't feel as good as a Rakdos Keyrune.

"One of the oldest" being more along the lines of the one that everyone learns of first, or at least within the first 3 infinite combos.
If we're going purely off MtG release dates, then yeah. It probably isn't THAT old. But that isn't what I meant by "oldest".

So, how's the rest of the deck looking anyway?

I'm a little surprised that some of what can be considered the all time cEDH staples, such as Rhystic Study, are not in here. Or an infinite combo that I could see either.
I would have gone for a Grapeshot or Brain Freeze too as an instant game ending card with how this deck is designed.

Overall, interested to see this deck play. Good job!

Huh. I didn't know that!
But I also thought that gris was French for grey. I work in liquor retail, and the variety known as Pinot Gris is decently popular in my area.

Yeah, Spider Spawning is too expensive for this deck and doesn't outright win the game when played. It'd be great for an EDH version of this deck though!

And Caustic Caterpillar seems like a good SB option, but I don't know how prevalent artifacts or enchantments are in Modern atm. The only deck that I really know of being super prevalent is Rakdos Scam.

Not that well known, apparently. And the important part was "how I think it does", which yes. It does.

Just putting it out there, that bit when making a deck labelled [DESCRIPTION] is great for this sort of thing!