Swamp

Stronghold Assassin

{T}, Sacrifice a creature: Destroy target nonblack creature.

Mana Leak

Counter target spell unless its controller pays {3}.

Jinxed Ring

Whenever a nontoken permanent is put into your graveyard from the battlefield, this artifact deals 1 damage to you.
Sacrifice a creature: Target opponent gains control of this artifact. (This effect lasts indefinitely.)

Megrim

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

Thalakos Deceiver

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, gain control of target creature. (This effect lasts indefinitely.)

Island

Torment

Enchant creature
Enchanted creature gets -3/-0.

Bottomless Pit

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

Contempt

Enchant creature
When enchanted creature attacks, return it and this Aura to their owners' hands at end of combat.

Grave Pact

Whenever a creature you control dies, each other player sacrifices a creature of their choice.

Tatsunari, Toad Rider

Whenever you cast an enchantment spell, if you don't control a creature named Keimi, create Keimi, a legendary 3/3 black and green Frog creature token with "Whenever you cast an enchantment spell, each opponent loses 1 life and you gain 1 life."
{1}{G/U}: Tatsunari and target Frog you control can't be blocked this turn except by creatures with flying or reach.

Sift

Mind Peel

Buyback {2}{B}{B} (You may pay an additional {2}{B}{B} as you cast this spell. If you do, put this card into your hand as it resolves.)
Target player discards a card.