Mortuary + Bolas's Citadel + Arcbound Ravager + Ornithopter

Mortuary

Bolas's Citadel

Arcbound Ravager

Ornithopter

How it works

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

This ingenious loop turns a modest flying machine into an endless engine of sacrifice and rebirth. By using Arcbound Ravager to feed on Ornithopter, you trigger Mortuary to neatly intercept the tiny artifact creature and slide it right back onto the top of your library. From there, Bolas's Citadel allows you to play the Ornithopter directly off the top for zero life, feeding it right back into the Ravager to generate an infinite storm count and endless +1/+1 counters.