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

Mortuary

Altar of Dementia

Bolas's Citadel

Rograkh, Son of Rohgahh

How it works

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

This elegant loop relies on Rograkh, Son of Rohgahh's zero mana value to cast it for free over and over again from the top of your library, a feat made possible by Bolas's Citadel allowing you to play spells from the top without paying their mana costs in actual mana. Each time you sacrifice Rograkh to Altar of Dementia to mill an opponent, Mortuary steps in to immediately recycle the creature straight back onto the top of your library, ensuring the fodder never runs dry. Because Bolas's Citadel replaces mana costs with life payments of zero for Rograkh, Son of Rohgahh, this self-sustaining cycle costs you nothing while generating infinite sacrifice and death triggers.