Urza, Prince of Kroog, Myr Battlesphere, and Ashnod's Altar

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Myr Battlesphere on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Urza by paying , creating a token copy of Myr Battlesphere that is a 1/1 Soldier in addition to its other types
2. The Myr Battlesphere token enters the battlefield, creating four 1/1 Myr artifact creature tokens
3. Activate Ashnod's Altar three times by sacrificing three Myr tokens, adding six
4. Repeat
5. Once you have infinite mana, you may use Urza to make infinite copies of any artifacts you control

Results

• Infinite colorless mana
• Infinite copies of artifacts you control
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers