Last Gasp

Fatal Push (88) and Dismember (72) are far more efficient or scalable; -3/-3 is only a narrow answer to small or indestructible creatures.

Could be wrong if A metagame concentrated on three-toughness or indestructible threats could create a sideboard niche.

Legacy's one-mana removal, especially Fatal Push (75), leaves little room for a two-mana spell capped at -3/-3.

Could be wrong if Toughness reduction's ability to answer indestructible threats may matter more than expected.

Compared with Cast Down (84), it misses too many larger creatures, but instant -3/-3 can be a niche answer to small or indestructible threats.

Could be wrong if If most key creatures have three or less toughness, it could become a more regular black removal option.

Two mana to give only -3/-3 is too narrow for multiplayer creature sizes and is readily replaced by unconditional removal.

Could be wrong if A dedicated -1/-1-counter or indestructible-heavy local metagame could make the effect more useful.

Cheap instant-speed removal that usually kills small creatures and wins combat is a premium common, though larger creatures can survive -3/-3.

Could be wrong if Unknown creature toughness, speed, and black removal depth could move it between solid and premium.