Derevi, Empyrial Tactician + Aether Vial + Cloudstone Curio + Deceiver Exarch

Derevi, Empyrial Tactician

Aether Vial

Cloudstone Curio

Deceiver Exarch

How it works

1. Activate Aether Vial by tapping it, putting Deceiver Exarch onto the battlefield from your hand.
2. When Deceiver Exarch enters the battlefield, it and Cloudstone Curio trigger.
3. Resolve the Deceiver Exarch trigger, untapping Aether Vial.
4. Resolve the Cloudstone Curio trigger, returning Derevi from the battlefield to your hand.
5. Activate Aether Vial by tapping it, putting Derevi onto the battlefield from your hand.
6. When Derevi enters the battlefield, it and Cloudstone Curio trigger.
7. Resolve the Derevi trigger, untapping Aether Vial.
8. Resolve the Cloudstone Curio trigger, returning Deceiver Exarch from the battlefield to your hand.
9. Repeat.

This elegant loop relies on Cloudstone Curio to bounce our permanents back and forth as they enter, leveraging shared types to keep the chain alive without ever running out of fuel. Aether Vial does the heavy lifting by cleanly cheating our threats directly onto the battlefield at instant speed, while Deceiver Exarch untaps that same Vial upon arrival so the process can immediately repeat. Finally, Derevi, Empyrial Tactician seamlessly steps in to tag-team the bouncing duties, ensuring we generate an endless torrent of entry and departure triggers.