The Lover's Death

Flash, Enchant creature
This spell may only be cast when a creature you control is killed by combat damage. Put a villain counter on the creature that destroyed it.
Enchanted creature gains "Purpose — When a creature with a villain counter leaves the battlefield, if this creature hasn't already achieved
its purpose, it achieves its purpose." and "When
this creature achieves its purpose, it gains
protection from all colors the creature with a
villain counter was."