Mutual Destruction

This spell has flash as long as you control a permanent with flash.
As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Liar's Pendulum

{2}, {T}: Choose a card name. Target opponent guesses whether a card with that name is in your hand. You may reveal your hand. If you do and your opponent guessed wrong, draw a card.

Cabal Therapy

Choose a nonland card name. Target player reveals their hand and discards all cards with that name.
Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Legion Conquistador

When this creature enters, you may search your library for any number of cards named Legion Conquistador, reveal them, put them into your hand, then shuffle.

Gathering Throng

When this creature enters, you may search your library for any number of cards named Gathering Throng, reveal them, put them into your hand, then shuffle.

Cabal Therapist

Menace
At the beginning of your first main phase, you may sacrifice a creature. When you do, choose a nonland card name, then target player reveals their hand and discards all cards with that name.

Orzhov Guildgate

This land enters tapped.
{T}: Add {W} or {B}.

Battalion Foot Soldier

When this creature enters, you may search your library for any number of cards named Battalion Foot Soldier, reveal them, put them into your hand, then shuffle.

Desperate Research

Choose a card name other than a basic land card name. Reveal the top seven cards of your library and put all of them with that name into your hand. Exile the rest.

Bone Splinters

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

Grave Peril

When a nonblack creature enters, sacrifice this enchantment. If you do, destroy that creature.