Marrow-Gnawer, Ashnod's Altar, and Sword of the Paruns

Prerequisites

• Marrow-Gnawer on the battlefield
• Ashnod's Altar on the battlefield
• Sword of the Paruns on the battlefield
• Sword of Paruns attached to Marrow-Gnawer
• Marrow-Gnawer does not have summoning sickness
• You control at least three additional Rats

Steps

1. Activate Marrow-Gnawer by tapping it and sacrificing another Rat, creating at least three 1/1 Rat creature tokens
2. Activate Ashnod's Altar twice by sacrificing two Rat tokens, adding
3. Activate Sword of Paruns by paying , untapping Marrow-Gnawer
4. Repeat

Results

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