Go for the Throatremoval$0.49Efficient black instant-speed creature removal that destroys most creatures for two mana. It is a clean functional cousin to Murder with a lower mana cost.
Hero's Downfallremoval$0.14Instant-speed black removal that hits creatures while also being able to answer planeswalkers. It costs the same mana as Murder and is often a stronger upgrade.
Infernal Graspremoval$7.00Very similar spot removal at instant speed for one less mana. The life loss is the main drawback compared to Murder's more generic destroy effect.
Power Word Killremoval$0.12Cheap black creature removal that destroys most non-Angel, non-Demon, non-Dragon, non-Devil creatures. It fills the same one-for-one removal role at a lower cost with a narrow restriction.
Cast Downremoval$0.67Efficient instant removal that destroys almost any nonlegendary creature. It is a close budget alternative to Murder with a narrower target restriction and lower cost.
Doom Bladeremoval$0.29Classic two-mana black instant removal that destroys a nonblack creature. It serves the same role as Murder with a lower cost but a color restriction.
Malfegorremoval$0.83Not a direct removal spell, but black-based decks sometimes use creature-based sacrifice effects to clear opposing boards. This is much broader and less efficient than Murder, but it can function as removal in similar black decks.
Defileremoval$1.76Very efficient black removal in mono-black decks, scaling with Swamps to kill larger creatures. It is a budget-friendly functional alternative when you want cheap creature interaction instead of a fixed three-mana destroy spell.