Mortuary + Wild Cantor + Vindictive Vampire + Bolas's Citadel

Mortuary

Wild Cantor

Vindictive Vampire

Bolas's Citadel

How it works

1. Activate Wild Cantor by sacrificing it.
2. When Wild Cantor dies, Mortuary and Vindictive Vampire trigger.
3. Resolve the Mortuary trigger, putting Wild Cantor from your graveyard onto the top of your library.
4. Resolve the Vindictive Vampire trigger, causing you to gain 1 life and dealing 1 damage to each opponent.
5. Cast Wild Cantor from the top of your library by paying 1 life.
6. Repeat.

This elegant loop lets you recast a single creature indefinitely right off the top of your library by leveraging Bolas's Citadel to trade life for mana value instead of paying real costs. Whenever you sacrifice Wild Cantor for mana, Mortuary catches it on its way to the graveyard and immediately places it right back on top of your library where the Citadel can see it again. Meanwhile, Vindictive Vampire quietly watches the whole process, turning every single iteration into a lethal stream of damage and life gain that easily closes out the game.