Duress

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

Megrim

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

Sinkhole

Magnivore

Haste (This creature can attack and {T} as soon as it comes under your control.)
Magnivore's power and toughness are each equal to the number of sorcery cards in all graveyards.

Mind Rot

Raze

As an additional cost to cast this spell, sacrifice a land.
Destroy target land.

Dragonskull Summit

Dragonskull Summit enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.

Cryoclasm

Destroy target Plains or Island. Cryoclasm deals 3 damage to that land's controller.

Liliana's Caress

Whenever an opponent discards a card, that player loses 2 life.

Dark Deal

Each player discards all the cards in their hand, then draws that many cards minus one.

Swamp

Lavaborn Muse

At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, Lavaborn Muse deals 3 damage to that player.

Blightning

Blightning deals 3 damage to target player or planeswalker. That player or that planeswalker's controller discards two cards.