Repercussion + Truefire Captain + Pariah's Shield

Repercussion

Truefire Captain

Pariah's Shield

How it works

1. Deal damage to Truefire Captain.
2. Truefire Captain and Repercussion trigger.
3. Resolve the Truefire Captain trigger, dealing damage to an applicable target.
4. Resolve the Repercussion trigger, dealing damage to Truefire Captain instead of you due to Pariah's Shield.
5. Repeat from step 2.

This loop creates an endless loop of self-sustaining punishment centered around Truefire Captain. By equipping the creature with Pariah's Shield, any incoming damage intended for you is redirected to the Captain instead. Every time Truefire Captain takes that damage, it triggers its own ability to deal damage to an opponent while simultaneously activating Repercussion, which punishes the Captain's controller—who is safely protected from taking that damage directly because the Shield intercepts it and sends it right back to the Captain.