Breya, Etherium Shaper, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Breya, Etherium Shaper on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• You control at least two additional creatures

Steps

1. Activate Ashnod's Altar by sacrificing two additional creatures, adding
2. Activate Ashnod's Altar by sacrificinng Breya, adding
3. Nim Deathmantle triggers, causing you to pay to return Breya from your graveyard to the battlefield, and attach Nim Deathmantle to it
4. Breya enters the battlefield, creating two 1/1 Thopter tokens
5. Repeat
6. Once you have infinite colorless mana, you may use it to activate Breya's other abilities

Results

• Infinite colorless mana
• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite sacrifice triggers