Prossh, Skyraider of Kher, Phyrexian Altar, and Ashnod's Altar

Prerequisites

• Prossh, Skyraider of Kher in the command zone
• Phyrexian Altar on the battlefield
• Ashnod's Altar on the battlefield
• plus enough mana to pay for commander tax, if applicable available

Steps

1. Cast Prossh from the command zone by paying plus commander tax, if applicable
2. Prossh triggers, creating a 0/1 Kobold of Kher Keep token for each mana spent to cast Prossh
3. Activate Ashnod's Altar by sacrificing Prossh, adding
4. Choose to have Prossh returned to the command zone
5. Activate Phyrexian Altar by sacrificing three Kobold of Kher Keep tokens, adding
6. Activate Ashnod's Altar by sacrificing a Kobold of Kher Keep token, adding
7. Repeat step 6 until you have enough mana to cast Prossh
8. Repeat from step 1

Results

• Infinite colored mana
• Infinite colorless mana
• Infinite commander casts
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers