Mortuary + Krark-Clan Ironworks + Shield Sphere + Gwenom, Remorseless

Mortuary

Krark-Clan Ironworks

Shield Sphere

Gwenom, Remorseless

How it works

1. Activate Krark-Clan Ironworks by sacrificing Shield Sphere
2. When Shield Sphere dies, Mortuary triggers, putting Shield Sphere from your graveyard onto the top of your library.
3. Cast Shield Sphere from the top of your library by paying 0 life.
4. Repeat.

This elegant engine turns a harmless zero-cost artifact into an infinite well of colorless mana and storm count. With Mortuary ensuring that any creature hitting your graveyard immediately returns to the top of your library, Krark-Clan Ironworks can repeatedly sacrifice Shield Sphere for fuel while Mortuary sends it right back where it started. Meanwhile, Gwenom, Remorseless provides the crucial alternate casting method, allowing you to bypass mana costs and recast Shield Sphere directly from the top of your library by paying life instead—a negligible cost that keeps the loop spinning indefinitely.