Mortuary + Blasting Station + Shield Sphere + Gwenom, Remorseless

Mortuary

Blasting Station

Shield Sphere

Gwenom, Remorseless

How it works

1. Activate Blasting Station by tapping it and 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 Blasting Station ability.
4. Cast Shield Sphere from the top of your library by paying 0 life.
5. When Shield Sphere enters, Blasting Station triggers, untapping Blasting Station.
6. Repeat.

This loop transforms the humble Shield Sphere into an infinite ammunition engine by leveraging its zero-mana cost. You use Blasting Station to sacrifice the Sphere, dealing damage while simultaneously setting up the reload; thanks to Mortuary, the sacrificed Sphere immediately goes straight to the top of your library rather than staying in the graveyard. Gwenom, Remorseless then acts as your makeshift hand by letting you cast the Sphere from the top of your library, paying zero life for its mana value due to Gwenom's alternative cost. Finally, every time that free Shield Sphere re-enters the battlefield, Blasting Station's triggered ability untaps itself so you can repeat the whole explosive process until your opponents are reduced to ash.