Masters Edition III

Blood Lust

If target creature has toughness 5 or greater, it gets +4/-4 until end of turn. Otherwise, it gets +4/-X until end of turn, where X is its toughness minus 1.

Fifth Edition

Target creature gets +4/-4 until end of turn. If this reduces that creature's toughness to less than 1, the creature's toughness is 1.

Renaissance

Fourth Edition Foreign Black Border

Fourth Edition

Target creature gets +4/-4 until end of turn. If this reduces creature's toughness to less than 1, creature's toughness becomes 1.

Legends

Target creatures gain +4/-4 until end of turn. If this reduces creature's toughness below 1, creature's toughness is 1.