Nim Deathmantle, Ashnod's Altar, and Ponyback Brigade

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Ponyback Brigade on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Ponyback Brigade, adding
2. Ponyback Brigade dies, triggering Nim Deathmantle, causing you to pay to return Ponyback Brigade from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Ponyback Brigade enters the battlefield, creating three 1/1 Goblin creature tokens
4. Activate Ashnod's Altar by sacrificing a Goblin, adding
5. Repeat

Results

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