Prossh, Skyraider of Kher, Ashnod's Altar, and Stonework Packbeast

Prerequisites

• Prossh, Skyraider of Kher in the command zone
• Ashnod's Altar on the battlefield
• Stonework Packbeast on the battlefield

Steps

1. Cast Prossh from the command zone by paying plus commander tax if applicable
2. Prossh triggers, creating a 0/1 Kobolds of Kher Keep token for each mana spent to cast it
3. Activate Ashnod's Altar by sacrificing Prossh, adding
4. Choose to return Prossh from your graveyard to the command zone
5. Activate Ashnod's Altar twice by sacrificing two Kobolds of Kher Keep tokens, adding
6. Activate Stonework Packbeast three times by paying , adding
7. Activate Ashnod's Altar by sacrificing a Kobolds of Kher Keep token, adding
8. Repeat step 7 until you have enough mana to cast Prossh
9. Repeat from step 1

Results

• Infinite colored mana
• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens
• Infinite death triggers
• Infinite magecraft triggers
• Infinite storm count
• Infinitely powerful creature until end of turn