Gloom

White spells cost {3} more to cast.
Activated abilities of white enchantments cost {3} more to activate.

Perish

Destroy all green creatures. They can't be regenerated.

Teferi's Puzzle Box

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

Quicksand

{T}: Add {C}.
{T}, Sacrifice this land: Target attacking creature without flying gets -1/-2 until end of turn.

Infernal Tribute

{2}, Sacrifice a nontoken permanent: Draw a card.

Dread of Night

Bottomless Pit

At the beginning of each player's upkeep, that player discards a card at random.

Dark Ritual

Vampiric Tutor

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Each player loses a third of their life, then discards a third of the cards in their hand, then sacrifices a third of the creatures they control of their choice, then sacrifices a third of the lands they control of their choice. Round up each time.

Diabolic Edict

Target player sacrifices a creature of their choice.

Nekrataal

First strike
When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Mind Warp

Look at target player's hand and choose X cards from it. That player discards those cards.

Wasteland

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target nonbasic land.

Drain Life

Spend only black mana on X.
Drain Life deals X damage to any target. You gain life equal to the damage dealt, but not more life than the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.

Megrim

Whenever an opponent discards a card, this enchantment deals 2 damage to that player.

Abyssal Specter

Flying
Whenever this creature deals damage to a player, that player discards a card.

Disrupting Scepter

{3}, {T}: Target player discards a card. Activate only during your turn.

Anvil of Bogardan

Players have no maximum hand size.
At the beginning of each player's draw step, that player draws an additional card, then discards a card.

Swamp

Ensnaring Bridge

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

Pit Imp

Flying
{B}: This creature gets +1/+0 until end of turn. Activate no more than twice each turn.

Coercion

Target opponent reveals their hand. You choose a card from it. That player discards that card.

Stupor

Target opponent discards a card at random, then discards a card.

Dauthi Mindripper

Shadow (This creature can block or be blocked by only creatures with shadow.)
Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards.