Chaos Emerald - Emotional Purp

When this artifact enters battlefield, target creature gains "{1}: regenerate this creature" until end of turn

Equipped creature has "{1}: regenerate target creature"
if you control 3 other emeralds, equipped creature gains "{8},{t} pay 3 life: prevent combat damage this turn"
Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)