Mortuary + Ashnod's Altar + Bolas's Citadel + Rograkh, Son of Rohgahh

Mortuary

Ashnod's Altar

Bolas's Citadel

Rograkh, Son of Rohgahh

How it works

1. Activate Ashnod's Altar by sacrificing Rograkh
2. When Rograkh dies, Mortuary triggers, putting Rograkh from your graveyard onto the top of your library.
3. Cast Rograkh from the top of your library by paying 0 life.
4. Repeat.

This clever loop hinges on Bolas's Citadel, which allows you to cast spells directly from the top of your library by paying life instead of mana. Because Rograkh, Son of Rohgahh has a mana value of zero, casting him from the top costs zero life, letting you deploy him for free. Once he's on the battlefield, you feed him to Ashnod's Altar to generate colorless mana, which also triggers Mortuary to seamlessly recycle Rograkh right back onto the top of your library. Repeating this process creates an infinite loop of sacrifices, creature drops, and colorless mana while keeping your life total untouched.