Very difficult pool! All your colours seem to drop off after card #7, and your bombs are in awkward colours. I feel like your deck has too few creatures, and a lot of bad cards.
To have enough good cards in the deck, I think you are forced to go three colour. My instinct is to try make a Blue-Green-Black deck. Blue gives you some good cards (Ongoing Investigation, Altered Ego, Epiphany at the Drownyard), decent removal, but few creatures. Black gives you decent creatures. Green gives you some fixing, which is important given the lack of it otherwise, and some delirium synergy. The deck has a lot of graveyard synergy in general.
This pool is very unfair in the amount of creatures you get. Blue has 3 creatures, white has 8, red has 8, (but not exactly high quality), black has 9, green has 8.
How do we build with this? Well, as usual, when you have a weak pool, you have to take more risks in order to get a few powerful plays.
Some comments on Gleng's suggestion first.
The Blue contributes very little to a deck's power with this pool. Out of every single blue card, The only one you'd ever actually want to play is sleep paralysis. It has stitched mangler, but the card is not always good. It depends which deck it's in. Since you will usually be on the defensive, removing a blocker while putting a tapped creature in play would be sub optimal. You will rarely want to topdeck this. Especially if it's your first play in the game, which IS likely, since the entire pool has only 5 two drops. Blue doesn't have any. That means if your opponent has two 2/1 in play for example, you play stitched mangler and tap one, but can't block the other. So you're giving your opponent an extra attack where a vanilla 2/3 would have stopped the attack completely.
For epiphany at the drownyard. It's not very good when casted for less than 5, so it won't help your early game. And since the pool is weak, it's unlikely that you'll have more than one card you actually want when you split the cards. And whichever pile that card is in, is the one your opponent will throw in your graveyard.
On pyre hound. I haven't built the deck yet, but considering that you're low on creatures, it will likely be usable for no other reason than the fact that you have more non-creature spells than usual.
Nahiri is repeatable removal, so we'll want to play her if we can. Adding a 3rd color for her is acceptable. We'll also try to play true-faith censer, since it lets us squeeze more value out of each creature and we cna cast it no matter what we play. Blue is a write off. I won't even bother unless we desperately splash ghastly wings. Black has some playables, but not enough to get us to 23 cards with white. So if we go black we'll be three colors. Not sold on hound of the farbog since you don't want a 5 mana creature with 3 toughness when you're on the defensive, and the menace could be hard to pull off. We have to consider it a vanilla 5/3. Green is in about the same spot as black, except it's more defensive until we get to 6 mana. Black has good early drops (more than green anyway) and kind of a bomb in necropod. After looking at every card three times. Black will be more consistent than green. So let's pick our 3rd color. Red. There's really no other choice.
We're low on removal, so red helps in that area. I will totally have to disagree with Gleng on Avacyn's judgment though. In limited, two damage for two mana is good. Two damage that you can split for two mana is even better. Since we don't have access to blue, it's almost strictly better than geistblast here. And there are ways to discard it in black/white, even though they are not many. But even if you had absolutely no way to play the madness, it would still be a must play card. Spiteful motives is a great card as well. It makes a 2 power creature take out a 5 toughness one and survive. So most of the time, it will act as removal. And then it sticks around to make your opponent's life a nightmare. Or you can use it to slip that extra 3 point of damage through. And of course we want Nahiri.
I'd actually go straight Black/Green delirium. In the absence of bombs that go with your pool, the key to sealed is ignoring the bombs and building a solid deck with good creatures and a good curve. B/G has that, including double Autumnal Gloom. I know you want to play Nahiri, but the color support just isn't there. In fact, your white cards are literal garbage except for Purge and Moonsilver. Your red is deceptively top-heavy. You have 4 or 5 very good cards and the rest are either filler or straight-up terrible. Your blue has three creatures, so forget it.
I also have another deck that I would like to get a look at too and will be posting that later when I have more time.
1x Angelic Purge
1x Apothecary Geist
1x Avacynian Missionaries
1x Bound by Moonsilver
1x Cathar's Companion
1x Chaplain's Blessing
2x Emissary of the Sleepless
1x Expose Evil
1x Inspiring Captain
1x Militant Inquisitor
1x Not Forgotten
1x Open the Armory
1x Stern Constable
1x Strength of Arms
Blue
1x Broken Concentration
1x Compelling Deterrence
1x Confirm Suspicions
1x Deny Existence
1x Epiphany at the Drownyard
1x Fleeting Memories
2x Ghostly Wings
1x Gone Missing
1x Lamplighter of Selhoff
1x Ongoing Investigation
1x Rise from the Tides
1x Sleep Paralysis
2x Stitched Mangler
1x Vessel of Paramnesia
1x Asylum Visitor
2x Crow of Dark Tidings
1x Ghoulcaller's Accomplice
1x Hound of the Farbogs
1x Liliana's Indignation
1x Macabre Waltz
1x Merciless Resolve
1x Morkrut Necropod
1x Sanitarium Skeleton
1x Shamble Back
1x Tooth Collector
1x Twins of Maurer Estate
Red
1x Avacyn's Judgment
1x Bloodmad Vampire
1x Breakneck Rider
1x Gatstaf Arsonists
1x Geistblast
1x Gibbering Fiend
1x Hulking Devil
1x Insolent Neonate
2x Magmatic Chasm
1x Pyre Hound
1x Rush of Adrenaline
1x Spiteful Motives
1x Structural Distortion
1x Uncaged Fury
1x Vessel of Volatility
1x Voldaren Duelist
1x Aim High
2x Autumnal Gloom
1x Groundskeeper
1x Intrepid Provisioner
1x Kessig Dire Swine
1x Loam Dryad
1x Moldgraf Scavenger
1x Moonlight Hunt
1x Quilled Wolf
1x Solitary Hunter
1x Traverse the Underwald
1x Ulvenwald Mysteries
1x Vessel of Nascency
1x Watcher in the Web
Multicolored
1x Altered Ego
1x Nahiri, the Harbinger
Artifacts
1x Epitaph Golem
1x Shard of Broken Glass
1x True-Faith Censer
1x Wicker Witch
1x Wild-Field Scarecrow
1x Bloodmad Vampire
1x Breakneck Rider
1x Geier Reach Bandit
1x Gibbering Fiend
1x Hulking Devil
1x Insolent Neonate
1x Pyre Hound
1x Voldaren Duelist
1x Cathar's Companion
1x Inspiring Captain
1x Stern Constable
1x Avacyn's Judgment
1x Geistblast
2x Magmatic Chasm
1x Rush of Adrenaline
1x Spiteful Motives
1x Structural Distortion
1x Uncaged Fury
1x Expose Evil
1x Not Forgotten
1x Nahiri, the Harbinger
Artifact
1x True-Faith Censer
Land
13 Mountain
4 Plains
I would avoid these
2 Magmatic Chasm
1 Insolent Neonate
1 Not Forgotten
1 Uncaged Fury
1 Spiteful Motives
1 Structural Distortion
To have enough good cards in the deck, I think you are forced to go three colour. My instinct is to try make a Blue-Green-Black deck. Blue gives you some good cards (Ongoing Investigation, Altered Ego, Epiphany at the Drownyard), decent removal, but few creatures. Black gives you decent creatures. Green gives you some fixing, which is important given the lack of it otherwise, and some delirium synergy. The deck has a lot of graveyard synergy in general.
Something like this (BGu):
1x Loam Dryad
1x Sanitarium Skeleton
2s
1x Moldgraf Scavenger
1x Quilled Wolf
1x Ghoulcaller's Accomplice
1x Asylum Visitor
3s
1x Tooth Collector
2x Crow of Dark Tidings
2x Stitched Mangler
1x Wild-Field Scarecrow
1x Solitary Hunter
5+
1x Hound of the Farbogs
1x Kessig Dire Swine
1x Morkrut Necropod
1x Altered Ego
Spells 6
1x Traverse the Ulvenwald
1x Vessel of Nascency
1x Epiphany at the Drownyard
1x Gone Missing
1x Sleep Paralysis
1x Ongoing Investigation
7x Forest
6x Swamp
4x Island
You are losing both Nahiri, the Harbinger and Avacyn's Judgement, but Avacyn's Judgement is only really good with madness, and Nahiri is hard to cast.
How do we build with this? Well, as usual, when you have a weak pool, you have to take more risks in order to get a few powerful plays.
Some comments on Gleng's suggestion first.
The Blue contributes very little to a deck's power with this pool. Out of every single blue card, The only one you'd ever actually want to play is sleep paralysis. It has stitched mangler, but the card is not always good. It depends which deck it's in. Since you will usually be on the defensive, removing a blocker while putting a tapped creature in play would be sub optimal. You will rarely want to topdeck this. Especially if it's your first play in the game, which IS likely, since the entire pool has only 5 two drops. Blue doesn't have any. That means if your opponent has two 2/1 in play for example, you play stitched mangler and tap one, but can't block the other. So you're giving your opponent an extra attack where a vanilla 2/3 would have stopped the attack completely.
For epiphany at the drownyard. It's not very good when casted for less than 5, so it won't help your early game. And since the pool is weak, it's unlikely that you'll have more than one card you actually want when you split the cards. And whichever pile that card is in, is the one your opponent will throw in your graveyard.
On pyre hound. I haven't built the deck yet, but considering that you're low on creatures, it will likely be usable for no other reason than the fact that you have more non-creature spells than usual.
Nahiri is repeatable removal, so we'll want to play her if we can. Adding a 3rd color for her is acceptable. We'll also try to play true-faith censer, since it lets us squeeze more value out of each creature and we cna cast it no matter what we play. Blue is a write off. I won't even bother unless we desperately splash ghastly wings. Black has some playables, but not enough to get us to 23 cards with white. So if we go black we'll be three colors. Not sold on hound of the farbog since you don't want a 5 mana creature with 3 toughness when you're on the defensive, and the menace could be hard to pull off. We have to consider it a vanilla 5/3. Green is in about the same spot as black, except it's more defensive until we get to 6 mana. Black has good early drops (more than green anyway) and kind of a bomb in necropod. After looking at every card three times. Black will be more consistent than green. So let's pick our 3rd color. Red. There's really no other choice.
We're low on removal, so red helps in that area. I will totally have to disagree with Gleng on Avacyn's judgment though. In limited, two damage for two mana is good. Two damage that you can split for two mana is even better. Since we don't have access to blue, it's almost strictly better than geistblast here. And there are ways to discard it in black/white, even though they are not many. But even if you had absolutely no way to play the madness, it would still be a must play card. Spiteful motives is a great card as well. It makes a 2 power creature take out a 5 toughness one and survive. So most of the time, it will act as removal. And then it sticks around to make your opponent's life a nightmare. Or you can use it to slip that extra 3 point of damage through. And of course we want Nahiri.
This is the deck it would make.
8 plains
6 swamp
3 mountain
Creatures
1x Sanitarium Skeleton
1x Asylum Visitor
1x Ghoulcaller's Accomplice
1x wild-field scarecrow
1x Apothecary Geist
1x Avacynian Missionaries
1x Cathar's Companion
1x Inspiring Captain
1x Militant Inquisitor
1x Stern Constable
2x Crow of Dark Tidings
1x Morkrut Necropod
1x Tooth Collector
1x Twins of Maurer Estate
1x Emissary of the Sleepless
1x Nahiri, the Harbinger
Spells
1x Expose Evil
1x Avacyn's Judgment
1x true-faith censer
1x Angelic Purge
1x Spiteful motives
1x Bound by Moonsilver
1x Sanitarium Skeleton
1x Asylum Visitor
2x Crow of Dark Tidings
1x Ghoulcaller's Accomplice
1x Morkrut Necropod
1x Intrepid Provisioner
1x Kessig Dire Swine
1x Moldgraf Scavenger
1x Quilled Wolf
1x Solitary Hunter
1x Watcher in the Web
1x Tooth Collector
1x Twins of Maurer Estate
1x Wild-Field Scarecrow
1x Traverse the Ulvenwald
1x Ulvenwald Mysteries
1x Vessel of Nascency
1x Aim High
2x Autumnal Gloom
1x Altered Ego
1x Sleep Paralysis
Lands:
2x Island
8x Swamp
7x Forest
Curve: (C = Creature, N = Non-creature)
1:CNN
2:CCCCN
3:CCCCNNN
4:CCNN
5:CC
6:CC
Signature courtesy of Rivenor and Miraculous Recovery
EDH Altered Cards by Galspanic (Seriously, this guy's awesome.)
My Pauper Cube
Tapped-Out Simulator
My Trade Thread
-Decks-
Commander:
GWR Rith, the Awakener RWG
U Kami of the Crescent Moon U (Flagship Deck)
BW Teysa, Orzhov Scion WB
Under Construction:
UBR Crosis, the Purger RBU
Cube:
WUBRGX Pauper XGRBUW