({2} magic symbol) ({U} magic symbol) without using ({R} magic symbol) available.
Steps
Cast Mirror Image by paying ({2} magic symbol) ({U} magic symbol) , without using ({R} magic symbol) , having it enter the battlefield as a copy of Crypt Champion.
Mirror Image enters the battlefield, triggering its first and second abilities.
Resolve the second Mirror Image trigger, causing you to sacrifice it.
Resolve the first Mirror Image trigger, returning Mirror Image from your graveyard to the battlefield as a copy of Crypt Champion.