Ravnica Allegiance

Gutterbones | Creature | Skeleton Warrior | Gutterbones enters the battlefield tapped. {1}{B}: Return Gutterbones from your graveyard to your hand. Activate only during your turn and only if an opponent lost life this turn. | Grzegorz Rutkowski

Pestilent Spirit | Creature | Spirit | Menace, deathtouch Instant and sorcery spells you control have deathtouch. (Any amount of damage they deal to a creature is enough to destroy it.) | Anastasia Ovchinnikova

Priest of Forgotten Gods | Creature | Human Cleric | {T}, Sacrifice two other creatures: Any number of target players each lose 2 life and sacrifice a creature. You add {B}{B} and draw a card. | Zack Stella

Rix Maadi Reveler | Creature | Human Shaman | Spectacle {2}{B}{R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.) When Rix Maadi Reveler enters the battlefield, discard a card, then draw a card. If Rix Maadi Reveler's spectacle cost was paid, instead discard your hand, then draw three cards. | Sara Winters

Teysa Karlov | Legendary Creature | Human Advisor | If a creature dying causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. Creature tokens you control have vigilance and lifelink. | Magali Villeneuve

Judith, the Scourge Diva | Legendary Creature | Human Shaman | Other creatures you control get +1/+0. Whenever a nontoken creature you control dies, Judith, the Scourge Diva deals 1 damage to any target. | Wesley Burt