Irenicus's Vile Duplication and Rakdos Carnarium in hand.
({3} magic symbol) ({U} magic symbol) available.
Steps
Cast Irenicus's Vile Duplication by paying ({3} magic symbol) ({U} magic symbol) , creating a nonlegendary token copy of Kodama of the East Tree with haste.
Play Rakdos Carnarium.
Both Kodama of the East Trees and Rakdos Carnarium trigger.
Resolve the token Kodama of the East Tree trigger, choosing not to put anything from your hand onto the battlefield.
Resolve the Rakdos Carnarium trigger, returning it to your hand from the battlefield.
Resolve the nontoken Kodama of the East Tree trigger, putting Rakdos Carnarium from your hand onto the battlefield.
The token Kodama of the East Tree and Rakdos Carnarium trigger.
Resolve the Rakdos Carnarium trigger, returning it to your hand from the battlefield.
Resolve the token Kodama of the East Tree trigger, putting Rakdos Carnarium from your hand onto the battlefield.
The nontoken Kodama of the East Tree and Rakdos Carnarium trigger.