Dualcaster Mage + Sevinne's Reclamation + Carrion Feeder

Dualcaster Mage

Sevinne's Reclamation

Carrion Feeder

How it works

1. Cast Sevinne's Reclamation by paying its mana cost, targeting any applicable target.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Sevinne's Reclamation.
4. Holding priority, activate Carrion Feeder by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Sevinne's Reclamation, with the copy targeting Dualcaster Mage
6. Resolve the Sevinne's Reclamation copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.

This loop turns Sevinne's Reclamation and Dualcaster Mage into a self-sustaining engine by exploiting the Mage's entry trigger to constantly copy the spell that brings it back. Carrion Feeder acts as the vital sacrifice outlet to put Dualcaster Mage back into the graveyard so it can be reanimated over and over again. Because Sevinne's Reclamation targets the Mage waiting in the graveyard, every iteration effortlessly feeds the Feeder with infinite sacrifices while generating an endless storm of enter-the-battlefield and death triggers.