Dualcaster Mage + Yahenni, Undying Partisan + Prison Break

Dualcaster Mage

Yahenni, Undying Partisan

Prison Break

How it works

1. Cast Prison Break either from your hand by paying 4 or from your graveyard for its mayhem cost by paying 3, targeting any applicable target.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Prison Break.
4. Holding priority, activate Yahenni by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Prison Break, with the copy targeting Dualcaster Mage
6. Resolve the Prison Break copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.

This cunning loop relies on an infinite recursion of entering and leaving the battlefield to continuously trigger your death and sacrifice synergies. By casting Prison Break to target a creature in your graveyard, you set the stage for Dualcaster Mage to flash in and copy that very spell, targeting the Mage itself for future returns. Meanwhile, Yahenni, Undying Partisan provides the necessary outlet to sacrifice the Mage in response, which not only feeds Yahenni's growing +1/+1 counters but also puts the Mage right back into the graveyard to be successfully resurrected by the copied Prison Break over and over again.