Mortuary + Atog + Ornithopter + Gwenom, Remorseless

Mortuary

Atog

Ornithopter

Gwenom, Remorseless

How it works

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

This loop turns a seemingly harmless mechanical bug into an unstoppable force by creating a closed recycling system. You use Atog to sacrifice Ornithopter, which triggers Mortuary to immediately tuck the free artifact creature back onto the top of your library instead of letting it rest. From there, Gwenom, Remorseless enables you to cast that very same Ornithopter straight off the top of your library for a mere zero life, feeding Atog infinite fodder and pumping it to astronomical proportions.