Nim Deathmantle, Ashnod's Altar, and Boss's Chauffeur

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Boss's Chauffeur on the battlefield
• Boss's Chauffeur has at least one +1/+1 counter on it
• available

Steps

1. Activate Ashnod's Altar by sacrificing Boss's Chauffeur, adding
2. When Boss's Chauffeur dies, its second ability and Nim Deathmantle trigger
3. Resolve the Nim Deathmantle trigger, causing you to pay to return Boss's Chauffeur from your graveyard to the battlefield with at least one +1/+1 counter, and attach Nim Deathmantle to it
4. Resolve the Boss's Chauffeur trigger, creating at least one 1/1 Citizen creature token
5. When the Citizen enters the battlefield, Boss's Chauffeur's first ability triggers, putting a +1/+1 counter on it
6. Activate Ashnod's Altar by sacrificing a Citizen, adding
7. Repeat

Results

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