Prossh, Skyraider of Kher, Phyrexian Altar, and Doubling Season

Prerequisites

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

Steps

1. Cast Prossh from the command zone by paying and commander tax, if applicable
2. Prossh triggers, creating a number of 0/1 Kobolds of Kher Keep creature tokens equal to twice the amount of mana spent to cast Prossh
3. Activate Phyrexian Altar three times by sacrificing Prossh and two Kobolds, adding
4. Choose to return Prossh to the command zone from your graveyard
5. Activate Phyrexian Altar by sacrificing a Kobold, adding
6. Repeat step 5 until you have enough mana to cast Prossh
7. Repeat from step 1

Results

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