Horror of Horrors

Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Horn of Deafening

{2}, {T}: Prevent all combat damage that would be dealt by target creature this turn.

All Hallow's Eve

Exile All Hallow's Eve with two scream counters on it.
At the beginning of your upkeep, if All Hallow's Eve is exiled with a scream counter on it, remove a scream counter from it. If there are no more scream counters on it, put it into your graveyard and each player returns all creature cards from their graveyard to the battlefield.

Crimson Kobolds

In the Eye of Chaos

Whenever a player casts an instant spell, counter it unless that player pays {X}, where X is its mana value.

Arena of the Ancients

Legendary creatures don't untap during their controllers' untap steps.
When Arena of the Ancients enters the battlefield, tap all legendary creatures.

Hell's Caretaker

{T}, Sacrifice a creature: Return target creature card from your graveyard to the battlefield. Activate only during your upkeep.

Al-abara's Carpet

{5}, {T}: Prevent all damage that would be dealt to you this turn by attacking creatures without flying.

Black Mana Battery

{2}, {T}: Put a charge counter on Black Mana Battery.
{T}, Remove any number of charge counters from Black Mana Battery: Add {B}, then add an additional {B} for each charge counter removed this way.

Immolation

Enchant creature
Enchanted creature gets +2/-2.

Juxtapose

You and target player exchange control of the creature you each control with the highest mana value. Then exchange control of artifacts the same way. If two or more permanents a player controls are tied for highest, their controller chooses one of them.

Boomerang

Return target permanent to its owner's hand.

Blue Mana Battery

{2}, {T}: Put a charge counter on Blue Mana Battery.
{T}, Remove any number of charge counters from Blue Mana Battery: Add {U}, then add an additional {U} for each charge counter removed this way.

Chains of Mephistopheles

If a player would draw a card except the first one they draw in each of their draw steps, that player discards a card instead. If the player discards a card this way, they draw a card. If the player doesn't discard a card this way, they mill a card.

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Caverns of Despair

No more than two creatures can attack each combat.
No more than two creatures can block each combat.

Crookshank Kobolds

Darkness

Prevent all combat damage that would be dealt this turn.

Demonic Torment

Enchant creature
Enchanted creature can't attack.
Prevent all combat damage that would be dealt by enchanted creature.

Eternal Warrior

Enchant creature
Enchanted creature has vigilance.

Flash Counter

Gaseous Form

Enchant creature
Prevent all combat damage that would be dealt to and dealt by enchanted creature.

Force Spike

Counter target spell unless its controller pays {1}.

Hammerheim

{T}: Add {R}.
{T}: Target creature loses all landwalk abilities until end of turn.

Gwendlyn Di Corci

{T}: Target player discards a card at random. Activate only during your turn.

Greed

Hellfire

Destroy all nonblack creatures. Hellfire deals X plus 3 damage to you, where X is the number of creatures that died this way.

Wall of Heat

Wall of Opposition

Defender (This creature can't attack.)
{1}: Wall of Opposition gets +1/+0 until end of turn.

Wall of Putrid Flesh

Defender (This creature can't attack.)
Protection from white
Prevent all damage that would be dealt to Wall of Putrid Flesh by enchanted creatures.

Wall of Shadows

Defender (This creature can't attack.)
Prevent all damage that would be dealt to Wall of Shadows by creatures it's blocking.
Wall of Shadows can't be the target of spells that can target only Walls or of abilities that can target only Walls.

Wall of Vapor

Defender (This creature can't attack.)
Prevent all damage that would be dealt to Wall of Vapor by creatures it's blocking.

Wall of Tombstones

Defender (This creature can't attack.)
At the beginning of your upkeep, change Wall of Tombstones's base toughness to 1 plus the number of creature cards in your graveyard. (This effect lasts indefinitely.)

Winds of Change

Each player shuffles the cards from their hand into their library, then draws that many cards.

Kobolds of Kher Keep

Kobold Taskmaster

Other Kobold creatures you control get +1/+0.

Kobold Overlord

First strike
Other Kobold creatures you control have first strike.

Kobold Drill Sergeant

Other Kobold creatures you control get +0/+1 and have trample.

Knowledge Vault

{2}, {T}: Exile the top card of your library face down.
{0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand.
When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's graveyard.

Land Equilibrium

If an opponent who controls at least as many lands as you do would put a land onto the battlefield, that player instead puts that land onto the battlefield then sacrifices a land.

Mana Drain

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Mana Matrix

Instant and enchantment spells you cast cost up to {2} less to cast.

Mirror Universe

{T}, Sacrifice Mirror Universe: Exchange life totals with target opponent. Activate only during your upkeep.

Planar Gate

Creature spells you cast cost up to {2} less to cast.

Nicol Bolas

Flying
At the beginning of your upkeep, sacrifice Nicol Bolas unless you pay {U}{B}{R}.
Whenever Nicol Bolas deals damage to an opponent, that player discards their hand.

Nether Void

Whenever a player casts a spell, counter it unless that player pays {3}.

Ramses Overdark

Remove Soul

Recall

Discard X cards, then return a card from your graveyard to your hand for each card discarded this way. Exile Recall.

Red Mana Battery

{2}, {T}: Put a charge counter on Red Mana Battery.
{T}, Remove any number of charge counters from Red Mana Battery: Add {R}, then add an additional {R} for each charge counter removed this way.

Ring of Immortals

{3}, {T}: Counter target instant or Aura spell that targets a permanent you control.

Rohgahh of Kher Keep

At the beginning of your upkeep, you may pay {R}{R}{R}. If you don't, tap Rohgahh of Kher Keep and all creatures named Kobolds of Kher Keep, then an opponent gains control of them.
Creatures you control named Kobolds of Kher Keep get +2/+2.

Sentinel

{0}: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel. (This effect lasts indefinitely.)

Serpent Generator

{4}, {T}: Create a 1/1 colorless Snake artifact creature token. It has "Whenever this creature deals damage to a player, that player gets a poison counter." (A player with ten or more poison counters loses the game.)

Spectral Cloak

Enchant creature
Enchanted creature has shroud as long as it's untapped. (It can't be the target of spells or abilities.)

The Abyss

At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of their choice. It can't be regenerated.

The Tabernacle at Pendrell Vale

All creatures have "At the beginning of your upkeep, destroy this creature unless you pay {1}."

Sol'kanar the Swamp King

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Whenever a player casts a black spell, you gain 1 life.

Time Elemental

When Time Elemental attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you.
{2}{U}{U}, {T}: Return target permanent that isn't enchanted to its owner's hand.

Tetsuo Umezawa

Tetsuo Umezawa can't be the target of Aura spells.
{U}{B}{B}{R}, {T}: Destroy target tapped or blocking creature.

Telekinesis

Tap target creature. Prevent all combat damage that would be dealt by that creature this turn. It doesn't untap during its controller's next two untap steps.

Tor Wauki

{T}: Tor Wauki deals 2 damage to target attacking or blocking creature.

Urborg

{T}: Add {B}.
{T}: Target creature loses first strike or swampwalk until end of turn.

Tolaria

{T}: Add {U}.
{T}: Target creature loses banding and all "bands with other" abilities until end of turn. Activate only during any upkeep step.

Underworld Dreams

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Wall of Dust

Defender (This creature can't attack.)
Whenever Wall of Dust blocks a creature, that creature can't attack during its controller's next turn.

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