Tobias, Doomed Conqueror, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Tobias, Doomed Conqueror on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Tobias, adding
2. Tobias dies, triggering itself and Nim Deathmantle
3. Resolve the Tobias trigger, creating at least one 2/2 Zombie creature token
4. Activate Ashnod's Altar by sacrificing the Zombie, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Tobias from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers