Mortuary + Bolas's Citadel + Carrion Feeder + Ornithopter

Mortuary

Bolas's Citadel

Carrion Feeder

Ornithopter

How it works

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

This ingenious engine turns a free sacrifice outlet into a self-sustaining loop by leveraging Mortuary to constantly recycle your creatures right back onto your library. With Bolas's Citadel sitting in play, you can effortlessly replay that recycled card straight off the top of your library for zero life instead of mana. Because Ornithopter costs no life to cast and feeds directly into Carrion Feeder's ability, you can repeat this process endlessly to amass infinite storm count, enter-the-battlefield triggers, and a massively growing Carrion Feeder.