Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Ashnod's Altar, and Maulfist Squad

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Ashnod's Altar on the battlefield
• Maulfist Squad on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Maulfist Squad
2. When Maulfist Squad dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Maulfist Squad enters, its fabricate ability triggers, putting a +1/+1 counter on it
4. Repeat

Results

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