Mortuary + Arcbound Ravager + Shield Sphere + Gwenom, Remorseless

Mortuary

Arcbound Ravager

Shield Sphere

Gwenom, Remorseless

How it works

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

This loop turns a free sacrifice outlet and a graveyard-stacking enchantment into an endless recycling engine. With Mortuary ensuring that any creature hitting your graveyard goes straight back to the top of your library, you can repeatedly feed Shield Sphere to Arcbound Ravager to grow it indefinitely. Because Shield Sphere costs zero mana, Gwenom, Remorseless lets you cast it for free straight off the top of your library—paying zero life for its mana value—allowing you to restart the cycle without spending a single resource.