Requires

Prossh, Skyraider of Kher must be in the command zone. Phyrexian Altar must be on the battlefield. Purphoros, God of the Forge must be on the battlefield. Prossh, Skyraider of Kher must be your commander. At least Mana needed: plus enough mana to pay for commander tax, if applicable

Steps

1. Cast Prossh from the command zone by paying and commander tax, if applicable.
2. Prossh triggers, creating a 0/1 Kobolds of Kher Keep token for each mana spent to cast it.
3. The Kobolds enter the battlefield, triggering Purphoros that many times, dealing 2 damage to each opponent for each Kobold.
4. Prossh enters the battlefield, triggering Purphoros, dealing 2 damage to each opponent.
5. Activate Phyrexian Altar three times by sacrificing Prossh and two Kobolds, adding .
6. Choose to return Prossh from your graveyard to the command zone.
7. Activate Phyrexian Altar by sacrificing all remaining Kobolds, adding for each Kobold sacrificed this way.
8. Repeat for each additional mana you have available.

Results