Ankh of Mishra

Whenever a land enters, this artifact deals 2 damage to that land's controller.

Tainted Remedy

If an opponent would gain life, that player loses that much life instead.

Collapsing Borders

Domain — At the beginning of each player's upkeep, that player gains 1 life for each basic land type among lands they control. Then this enchantment deals 3 damage to that player.

Howling Mine

At the beginning of each player's draw step, if this artifact is untapped, that player draws an additional card.

Jet Medallion

Black spells you cast cost {1} less to cast.

Bottled Cloister

At the beginning of each opponent's upkeep, exile all cards from your hand face down.
At the beginning of your upkeep, return all cards you own exiled with this artifact to your hand, then draw a card.

Ensnaring Bridge

Creatures with power greater than the number of cards in your hand can't attack.

Impatience

At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player.

Exquisite Blood

Whenever an opponent loses life, you gain that much life.

Myriad Landscape

This land enters tapped.
{T}: Add {C}.
{2}, {T}, Sacrifice this land: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

Leaden Myr

Swamp

Spellshock

Whenever a player casts a spell, this enchantment deals 2 damage to that player.

Sol Ring

Citadel of Pain

At the beginning of each player's end step, this enchantment deals X damage to that player, where X is the number of untapped lands they control.

Dogged Pursuit

At the beginning of your end step, each opponent loses 1 life and you gain 1 life.

Sheoldred, the Apocalypse

Deathtouch
Whenever you draw a card, you gain 2 life.
Whenever an opponent draws a card, they lose 2 life.

Mountain

Black Mana Battery

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

Manabarbs

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.