Basilica Screecher

Flying
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Assassin's Strike

Destroy target creature. Its controller discards a card.

Teysa, Envoy of Ghosts

Vigilance, protection from creatures
Whenever a creature deals combat damage to you, destroy that creature. Create a 1/1 white and black Spirit creature token with flying.

Riot Control

You gain 1 life for each creature your opponents control. Prevent all damage that would be dealt to you this turn.

Bane Alley Blackguard

Dark Revenant

Flying
When Dark Revenant dies, put it on top of its owner's library.

Basilica Guards

Defender
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Loss

Creatures your opponents control get -1/-1 until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Profit

Creatures you control get +1/+1 until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Profit // Loss

Fatal Fumes

Target creature gets -4/-2 until end of turn.

Maw of the Obzedat

Sacrifice a creature: Creatures you control get +1/+1 until end of turn.

Tithe Drinker

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Crypt Incursion

Exile all creature cards from target player's graveyard. You gain 3 life for each card exiled this way.

Orzhov Cluestone

{T}: Add {W} or {B}.
{W}{B}, {T}, Sacrifice Orzhov Cluestone: Draw a card.

Smog Elemental

Flying
Creatures with flying your opponents control get -1/-1.

Steeple Roc

Orzhov Guildgate

Orzhov Guildgate enters the battlefield tapped.
{T}: Add {W} or {B}.

Sin Collector

When Sin Collector enters the battlefield, target opponent reveals their hand. You choose an instant or sorcery card from it and exile that card.

Plains

Swamp

Crypt Ghast

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you tap a Swamp for mana, add an additional {B}.

Dying Wish

Enchant creature you control
When enchanted creature dies, target player loses X life and you gain X life, where X is its power.

Kingpin's Pet

Ubul Sar Gatekeepers

When Ubul Sar Gatekeepers enters the battlefield, if you control two or more Gates, target creature an opponent controls gets -2/-2 until end of turn.

Bazaar Krovod

Whenever Bazaar Krovod attacks, another target attacking creature gets +0/+2 until end of turn. Untap that creature.