Nim Deathmantle, Ashnod's Altar, and Orzhov Racketeers

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Orzhov Racketeers on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Orzhov Racketeers, adding
2. When Orzhov Racketeers dies, its afterlife ability and Nim Deathmantle trigger
3. Resolve the Orzhov Racketeers trigger, creating two 1/1 Spirit creature tokens
4. Activate Ashnod's Altar by sacrificing a Spirit, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Orzhov Racketeers 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