Mortuary + Carmen, Cruel Skymarcher + Wild Cantor + Bolas's Citadel

Mortuary

Carmen, Cruel Skymarcher

Wild Cantor

Bolas's Citadel

How it works

1. Activate Wild Cantor by sacrificing it.
2. When Wild Cantor dies, Mortuary and Carmen trigger.
3. Resolve the Mortuary trigger, putting Wild Cantor from your graveyard onto the top of your library.
4. Resolve the Carmen trigger, causing you to gain 1 life and put a +1/+1 counter on Carmen.
5. Cast Wild Cantor from the top of your library by paying 1 life.
6. Repeat.

This clever loop relies on Bolas's Citadel to bypass traditional mana costs, allowing you to cast Wild Cantor directly from the top of your library simply by paying life instead of mana. Each time you sacrifice Wild Cantor for mana, Mortuary gently intercepts the creature as it hits the graveyard and places it right back onto the top of your library. Meanwhile, Carmen, Cruel Skymarcher happily watches the sacrifice happen, growing larger with a +1/+1 counter and padding your life total to offset the cost of casting through the Citadel.