Flying

If damage would be dealt to you, prevent that damage and mill twice that many cards.

Spells and abilities your opponents control can't cause their controller to search their library.

-1: Target player mills four cards. Then exile each opponent's graveyard.

+1: Create a 2/3 blue and black Nightmare creature token with "Whenever this creature attacks or blocks, each opponent exiles the top two cards of their library."

-3: Return target nonland permanent to its owner's hand, then that player exiles a card from their hand.

-7: You may cast up to three spells from among face-up cards your opponents own from exile without paying their mana costs.

+2: Exile the top three cards of target opponent's library.

-X: Put a creature card with mana value X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types.

-10: Exile all cards from all opponents' hands and graveyards.

Lifelink, haste

At the beginning of your end step, you may sacrifice an artifact, creature, enchantment, land, or planeswalker. If you do, each opponent may sacrifice a permanent that shares a card type with it. For each opponent who doesn't, that player loses 2 life and you draw a card.

When Brain Maggot enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card until Brain Maggot leaves the battlefield.

Return target permanent to its owner's hand. If that permanent is red or green, put it on top of its owner's library instead.

Consuming Aberration's power and toughness are each equal to the number of cards in your opponents' graveyards.

Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Counter target noncreature spell. Its controller loses 2 life.

Exile all creature cards from target player's graveyard. You gain 3 life for each card exiled this way.

Whenever one or more cards are put into your graveyard from your library, Devourer of Memory gets +1/+1 until end of turn and can't be blocked this turn.

{1}{U}{B}: Mill a card.

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Flying, trample

Pay 2 life: Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Whenever a Swamp enters the battlefield under your control, choose one --

• You draw a card and you lose 1 life.

• Dread Presence deals 2 damage to any target and you gain 2 life.

Flash

Flying

When Dream Eater enters the battlefield, surveil 4. When you do, you may return target nonland permanent an opponent controls to its owner's hand. (To surveil 4, look at the top four cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Choose one. If you control a commander as you cast this spell, you may choose both.

• Target player draws X cards.

• Target player mills twice X cards.

When Faceless Butcher enters the battlefield, exile target creature other than Faceless Butcher.

When Faceless Butcher leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Shadow (This creature can block or be blocked by only creatures with shadow.)

When Faceless Devourer enters the battlefield, exile another target creature with shadow.

When Faceless Devourer leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Flying

When Foul Watcher enters the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Delirium -- Foul Watcher gets +1/+0 as long as there are four or more card types among cards in your graveyard.

Defender

{2}{B}, Sacrifice a creature: You gain 1 life and draw a card.

When Gravegouger enters the battlefield, exile up to two target cards from a single graveyard.

When Gravegouger leaves the battlefield, return the exiled cards to their owner's graveyard.

Grimdancer enters the battlefield with your choice of two different counters on it from among menace, deathtouch, and lifelink.

Menace

When Hunted Nightmare enters the battlefield, target opponent puts a deathtouch counter on a creature they control.

Flying

When Hypnox enters the battlefield, if you cast it from your hand, exile all cards from target opponent's hand.

When Hypnox leaves the battlefield, return the exiled cards to their owner's hand.

When Laquatus's Champion enters the battlefield, target player loses 6 life.

When Laquatus's Champion leaves the battlefield, that player gains 6 life.

{B}: Regenerate Laquatus's Champion.

When Mesmeric Fiend enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card.

When Mesmeric Fiend leaves the battlefield, return the exiled card to its owner's hand.

Destroy target creature.

Until end of turn, all creatures become black and all lands become Swamps.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Nightmare's power and toughness are each equal to the number of Swamps you control.

Flying

Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.

Target creature gets -X/-X until end of turn, where X is the number of cards in your hand.

Plague Mare can't be blocked by white creatures.

When Plague Mare enters the battlefield, creatures your opponents control get -1/-1 until end of turn.

Shuffle all cards from your graveyard into your library. Target player mills that many cards.

Flying

When Psychic Symbiont enters the battlefield, target opponent discards a card and you draw a card.

Tap up to two target creatures.

Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, those creatures don't untap during their controllers' next untap steps.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

When Slithery Stalker enters the battlefield, exile target green or white creature an opponent controls.

When Slithery Stalker leaves the battlefield, return the exiled card to the battlefield under its owner's control.

{U/P}: Change a target of target spell or ability to Spellskite. ({U/P} can be paid with either {U} or 2 life.)

Umbris, Fear Manifest gets +1/+1 for each card your opponents own in exile.

Whenever Umbris or another Nightmare or Horror enters the battlefield under your control, target opponent exiles cards from the top of their library until they exile a land card.

Deathtouch

Cycling {2}{B} ({2}{B}, Discard this card: Draw a card.)

When you cycle Void Beckoner, put a deathtouch counter on target creature you control.

Devoid (This card has no color.)

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.