Remembrance + Mortuary + Ornithopter + Yahenni, Undying Partisan

Remembrance

Mortuary

Ornithopter

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Ornithopter.
2. When Ornithopter dies, Mortuary and Remembrance trigger.
3. Resolve the Mortuary trigger, putting Ornithopter from your graveyard on top of your library.
4. Resolve the Remembrance trigger, searching your library for Ornithopter and putting it into your hand.
5. Resolve the Yahenni ability.
6. Cast Ornithopter by paying 0.
7. Repeat.

This elegant loop relies on the free sacrifice outlet of Yahenni, Undying Partisan to continually send our zero-mana artifact creature, Ornithopter, into the graveyard. Whenever Ornithopter hits the bin, Mortuary catches it on its way and places it right back on top of your library, while Remembrance simultaneously triggers to tutor up another copy straight to your hand. Because Ornithopter costs a mere {0} to recast, you can immediately replay it and feed it back to Yahenni, generating an endless cascade of leaves-the-battlefield, entry, sacrifice, and death triggers to fuel your storm count.