Ravnica Allegiance

Bedevil | Instant | | Destroy target artifact, creature, or planeswalker. | Seb McKinnon

Hackrobat | Creature | Human Rogue | Spectacle {B}{R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.) {B}: Hackrobat gains deathtouch until end of turn. {R}: Hackrobat gets +2/-2 until end of turn. | Simon Dominic

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

Rakdos Roustabout | Creature | Ogre Warrior | Whenever Rakdos Roustabout becomes blocked, it deals 1 damage to the player or planeswalker it's attacking. | Lucas Graciano

Theater of Horrors | Enchantment | | At the beginning of your upkeep, exile the top card of your library. During your turn, if an opponent lost life this turn, you may play lands and cast spells from among cards exiled with Theater of Horrors. {3}{R}: Theater of Horrors deals 1 damage to target opponent or planeswalker. | Daarken

Rakdos Locket | Artifact | | {T}: Add {B} or {R}. {B/R}{B/R}{B/R}{B/R}, {T}, Sacrifice Rakdos Locket: Draw two cards. | Sung Choi