Dualcaster Mage + Faith's Reward + Yahenni, Undying Partisan

Dualcaster Mage

Faith's Reward

Yahenni, Undying Partisan

How it works

1. Cast Faith's Reward by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Faith's Reward.
4. Holding priority, activate Yahenni by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Faith's Reward
6. Resolve the Faith's Reward copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.

This ingenious loop starts by casting Faith's Reward to mark your permanents for return, immediately backed by Dualcaster Mage entering the battlefield to copy that very spell. While the original spell waits on the stack, Yahenni, Undying Partisan steps in as the ultimate executioner and safety net, sacrificing the Mage to its own ability to trigger death counts while binning it right where Faith's Reward's copy can grab it. As the copied Faith's Reward resolves, it drags Dualcaster Mage right back onto the battlefield to copy the original spell all over again, creating an endless cycle of sacrifice and resurrection.