As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.
{4}{B}{B}
Abyssal Horror
Creature - Horror
Flying
When Abyssal Horror enters the battlefield, target player discards two cards.
2 /
2
{1}{B}
Addle
Sorcery
Choose a color. Target player reveals their hand and you choose a card of that color from it. That player discards that card.
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{3}{B}{B}
Tergrid, God of Fright
Legendary Creature - God
Menace
Whenever an opponent sacrifices a nontoken permanent or discards a permanent card, you may put that card from a graveyard onto the battlefield under your control.
4 /
5
--
Tergrid's Lantern
Legendary Artifact
{T}: Target player loses 3 life unless they sacrifice a nonland permanent or discard a card.