Remembrance + Mortuary + Shield Sphere + Yahenni, Undying Partisan

Remembrance

Mortuary

Shield Sphere

Yahenni, Undying Partisan

How it works

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

This loop transforms the free, zero-mana casting cost of Shield Sphere into an infinite engine for sacrifice and death triggers. By feeding the Sphere to Yahenni, Undying Partisan's sacrifice ability, you trigger both Mortuary and Remembrance simultaneously; Mortuary places the dying artifact creature directly back on top of your library, while Remembrance lets you tutor a copy straight into your hand. This ensures that the free-to-cast Shield Sphere is immediately ready to be deployed once more, continuously fueling Yahenni with indestructible protection and racking up endless triggers.