Toph, the First Metalbender + Retreat to Emeria + Haru, Hidden Talent + Dark Sphere

Toph, the First Metalbender

Retreat to Emeria

Haru, Hidden Talent

Dark Sphere

How it works

1. Cast Dark Sphere by paying its mana cost.
2. When Dark Sphere enters, Retreat to Emeria triggers, creating a 1/1 Kor Ally creature token.
3. When the Kor Ally enters, Haru triggers, earthbending Dark Sphere.
4. Activate Dark Sphere by tapping and sacrificing it.
5. Haru triggers, returning Dark Sphere from your graveyard to the battlefield.
6. Repeat steps 2 and 3 once.
7. Resolve the Dark Sphere ability from step 4.
8. Repeat from step 4.