Rakdos Cluestone

{T}: Add {B} or {R}.
{B}{R}, {T}, Sacrifice this artifact: Draw a card.

Accursed Marauder

When this creature enters, each player sacrifices a nontoken creature of their choice.

Village Rites

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Mountain

Acolyte of Aclazotz

{T}, Sacrifice another creature or artifact: Each opponent loses 1 life and you gain 1 life.

Burnt Offering

As an additional cost to cast this spell, sacrifice a creature.
Add X mana in any combination of {B} and/or {R}, where X is the sacrificed creature's mana value.

Cornered by Black Mages

Target opponent sacrifices a creature of their choice.
Create a 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent."

Body Dropper

Whenever you sacrifice another creature, put a +1/+1 counter on this creature.
{B}{R}, Sacrifice another creature: This creature gains menace until end of turn. (It can't be blocked except by two or more creatures.)

Bile Urchin

Sacrifice this creature: Target player loses 1 life.

Blood Bairn

Sacrifice another creature: This creature gets +2/+2 until end of turn.

Fireblade Artist

Haste
At the beginning of your upkeep, you may sacrifice a creature. When you do, this creature deals 2 damage to target opponent or planeswalker.

Accursed Centaur

When this creature enters, sacrifice a creature.

Sadistic Glee

Enchant creature
Whenever a creature dies, put a +1/+1 counter on enchanted creature.

Bottle Gnomes

Sacrifice this creature: You gain 3 life.

Basal Thrull

{T}, Sacrifice this creature: Add {B}{B}.

Rakdos Signet

Adorned Crocodile

When this creature dies, create a 2/2 black Zombie Druid creature token.
Renew — {B}, Exile this card from your graveyard: Put a +1/+1 counter on target creature. Activate only as a sorcery.

Swamp

Furnace Scamp

Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, this creature deals 3 damage to that player.

Blitzball

{T}: Add one mana of any color.
GOOOOAAAALLL! — {T}, Sacrifice this artifact: Draw two cards. Activate only if an opponent was dealt combat damage by a legendary creature this turn.