Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Ashnod's Altar, and Cold-Blooded Crew

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Ashnod's Altar on the battlefield
• Cold-Blooded Crew on the battlefield

Steps

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

Results

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