Wan Shi Tong, All-Knowing, Library of Leng, Urza, Powerstone Prodigy, Intruder Alarm, and Ashnod's Altar

Prerequisites

• Wan Shi Tong, All-Knowing on the battlefield
• Library of Leng on the battlefield
• Urza, Powerstone Prodigy on the battlefield
• Intruder Alarm on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Urza by paying , causing you to loot
2. The discarded card will be put on top of your library instead of into your graveyard due to Library of Leng
3. Wan Shi Tong's second ability triggers, creating two 1/1 Spirit creature tokens
4. When the Spirits enter, Intruder Alarm triggers twice, untapping all creatures
5. Activate Ashnod's Altar by sacrificing a Spirit, adding
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite creature tokens
• Infinite self-discard triggers
• Infinite draw triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures