Abyssal Harvester + Ashnod's Altar + Thornbite Staff + Eternal Scourge

Abyssal Harvester

Ashnod's Altar

Thornbite Staff

Eternal Scourge

How it works

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding CC.
2. When Eternal Scourge dies, Abyssal Harvester triggers, untapping itself.
3. Activate Abyssal Harvester by tapping it, exiling Eternal Scourge from your graveyard and create a token copy of Eternal Scourge that is a Nightmare in addition to its other types.
4. Activate Ashnod's Altar by sacrificing the Eternal Scourge token, adding CC.
5. When the Eternal Scourge token dies, Abyssal Harvester triggers, untapping itself.
6. Cast Eternal Scourge from exile by paying 3.
7. Repeat.