Cruelty Spawn

Menace
Whenever another creature dies, Cruelty Spawn costs {u}, {b}, or {r} less until the end of turn.
When Cruelty Spawn deals combat damage to an opponent, return target instant or sorcery card from your graveyard to your hand.
"One can't imagine the horror required to attract such creatures," — Adiya Var, Kanakai Queen