So it has been a while since Standard had a relatively strong two-card combo, let alone one this ugly:

The idea here is to target yourself with "Peer into the Abyss," drawing roughly 20 cards and milling your opponent close to 40. The rest of the deck simply supports this strategy either with counters/removal to keep you alive like Drown in the Loch and Eliminate or card selection via Grim Tutor and Narset, Parter of Veils. If you like both beating your opponent out of nowhere and disgusting them with grotesque artwork along the way, this deck is perfect for you.

Magic: The Gathering TCG Deck - Abyss Mill Bomb by Merchant

'Abyss Mill Bomb' - constructed deck list and prices for the Magic: The Gathering Trading Card Game from TCGplayer Infinite!

Created By: Merchant

Event:

Rank:

Standard

Market Price: $158.16

Cards

Thought Erasure

Color Identity:B,U

Market Price: $0.22

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/175178_200w.jpg

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

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Grim Tutor

Color Identity:B

Market Price: $15.67

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215341_200w.jpg

Search your library for a card, put that card into your hand, then shuffle. You lose 3 life.

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Castle Vantress

Color Identity:U

Market Price: $2.11

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/199284_200w.jpg

Castle Vantress enters the battlefield tapped unless you control an Island.
{T}: Add {U}.
{2}{U}{U}, {T}: Scry 2.

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Ritual of Soot

Color Identity:B

Market Price: $0.43

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/176681_200w.jpg

Destroy all creatures with mana value 3 or less.

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Castle Locthwain

Color Identity:B

Market Price: $4.16

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/199388_200w.jpg

Castle Locthwain enters the battlefield tapped unless you control a Swamp.
{T}: Add {B}.
{1}{B}{B}, {T}: Draw a card, then you lose life equal to the number of cards in your hand.

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Extinction Event

Color Identity:B

Market Price: $0.63

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/212261_200w.jpg

Choose odd or even. Exile each creature with mana value of the chosen quality. (Zero is even.)

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Peer into the Abyss

Color Identity:B

Market Price: $0.38

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215373_200w.jpg

Target player draws cards equal to half the number of cards in their library and loses half their life. Round up each time.

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Teferi's Tutelage

Color Identity:U

Market Price: $0.49

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215365_200w.jpg

When Teferi's Tutelage enters the battlefield, draw a card, then discard a card.
Whenever you draw a card, target opponent mills two cards. (They put the top two cards of their library into their graveyard.)

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Watery Grave

Color Identity:B,U

Market Price: $11.20

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/175205_200w.jpg

({T}: Add {U} or {B}.)
As Watery Grave enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

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Kaheera, the Orphanguard

Color Identity:G,W

Market Price: $1.13

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/212596_200w.jpg

Companion — Each creature card in your starting deck is a Cat, Elemental, Nightmare, Dinosaur, or Beast card. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} any time you could cast a sorcery.)
Vigilance
Each other creature you control that's a Cat, Elemental, Nightmare, Dinosaur, or Beast gets +1/+1 and has vigilance.

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Temple of Deceit

Color Identity:B,U

Market Price: $0.48

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/248800_200w.jpg

Temple of Deceit enters the battlefield tapped.
When Temple of Deceit enters the battlefield, scry 1.
{T}: Add {U} or {B}.

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Eliminate

Color Identity:B

Market Price: $0.04

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215516_200w.jpg

Destroy target creature or planeswalker with mana value 3 or less.

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Swamp

Color Identity:B

Market Price: $0.07

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/196476_200w.jpg

({T}: Add {B}.)

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Island

Color Identity:U

Market Price: $0.05

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215718_200w.jpg

({T}: Add {U}.)

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Drown in the Loch

Color Identity:B,U

Market Price: $1.92

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/199207_200w.jpg

Choose one —
• Counter target spell with mana value less than or equal to the number of cards in its controller's graveyard.
• Destroy target creature with mana value less than or equal to the number of cards in its controller's graveyard.

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Teferi, Master of Time

Color Identity:U

Market Price: $9.12

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/215349_200w.jpg

You may activate loyalty abilities of Teferi, Master of Time on any player's turn any time you could cast an instant.
+1: Draw a card, then discard a card.
−3: Target creature you don't control phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)
−10: Take two extra turns after this one.

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Narset, Parter of Veils

Color Identity:U

Market Price: $1.23

ImageURL: https://tcgplayer-cdn.tcgplayer.com/product/188705_200w.jpg

Each opponent can't draw more than one card each turn.
−2: Look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Buy This Card! https://www.tcgplayer.com/product/188705/magic-war-of-the-spark-narset-parter-of-veils