Lightning Crafter

Champion represents two triggered abilities. “Champion an [object]” means “When this permanent enters, sacrifice it unless you exile another [object] you control” and “When this permanent leaves the battlefield, return the exiled card to the battlefield under its owner’s control.”

The two abilities represented by champion are linked. See rule 607, “Linked Abilities.”

A permanent is “championed” by another permanent if the latter exiles the former as the direct result of a champion ability.