Requires

Nalfeshnee must be on the battlefield. Eternal Scourge must be on the battlefield. Ashnod's Altar must be on the battlefield. Planar Void must be on the battlefield. Mana needed:

Steps

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding .
2. Eternal Scourge dies, triggering Planar Void, exiling Eternal Scourge.
3. Cast Eternal Scourge from exile by paying .
4. Nalfeshnee triggers, creating a token copy of Eternal Scourge with haste.
5. Activate Ashnod's Altar by sacrificing the Eternal Scourge token, adding .
6. Repeat.

Results