Retreat to Coralhelm + Sakura-Tribe Scout + Rakdos Carnarium

Retreat to Coralhelm

Sakura-Tribe Scout

Rakdos Carnarium

How it works

1. Activate Sakura-Tribe Scout by tapping it, putting Rakdos Carnarium from your hand onto the battlefield.
2. When Rakdos Carnarium enters the battlefield, it and Retreat to Coralhelm trigger.
3. Resolve the Rakdos Carnarium trigger, returning itself from the battlefield to your hand.
4. Resolve the Retreat to Coralhelm trigger, untapping Sakura-Tribe Scout.
5. Repeat.