Mortuary + Woe Strider + Bolas's Citadel + Ornithopter

Mortuary

Woe Strider

Bolas's Citadel

Ornithopter

How it works

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

This ingenious loop turns a humble free sacrifice outlet and a zero-mana flyer into an endless engine of discovery and repetition. With Bolas's Citadel sitting on your battlefield, you can cast the top card of your library by paying life equal to its mana value instead of its mana cost, allowing you to redeploy the Ornithopter you just sacrificed for zero life. As Woe Strider sends that very same Ornithopter to the graveyard, Mortuary immediately intercepts it, placing the artifact creature right back on top of your library to be played once more. Meanwhile, Woe Strider's built-in ability lets you smooth out your draws with infinite scry triggers as you repeat this process endlessly, generating an infinite storm count and endless creature triggers.