Ostracize

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

Dark Ritual

Force Spike

Counter target spell unless its controller pays {1}.

Duress

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

Oppression

Whenever a player casts a spell, that player discards a card.

Annul

Counter target artifact or enchantment spell.

Hydroblast

Choose one —
• Counter target spell if it's red.
• Destroy target permanent if it's red.

Underground River

{T}: Add {C}.
{T}: Add {U} or {B}. This land deals 1 damage to you.

Hypnotic Specter

Flying
Whenever this creature deals damage to an opponent, that player discards a card at random.

Counterspell

Withered Wretch

Stupor

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

Fact or Fiction

Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Recoil

Return target permanent to its owner's hand. Then that player discards a card.

Portent

Look at the top three cards of target player's library, then put them back in any order. You may have that player shuffle.
Draw a card at the beginning of the next turn's upkeep.

Swamp

Ravenous Rats

When this creature enters, target opponent discards a card.

Undermine

Counter target spell. Its controller loses 3 life.

Shadowmage Infiltrator

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever this creature deals combat damage to a player, you may draw a card.

Island

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Polluted Delta

{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.