Toph, the First Metalbender + Haru, Hidden Talent + Firdoch Core + Altar of Dementia

Toph, the First Metalbender

Haru, Hidden Talent

Firdoch Core

Altar of Dementia

How it works

1. Cast Firdoch Core by paying 3.
2. When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
3. Activate Altar of Dementia by sacrificing Firdoch Core.
4. When Firdoch Core dies, Haru triggers, returning Firdoch Core from your graveyard to the battlefield.
5. When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
6. Resolve the Altar of Dementia ability.
7. Repeat from step 3.