Godsire, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Godsire on the battlefield
• Thornbite Staff on the battlefield
• Ashnod's Altar on the battlefield
• Thornbite Staff attached to Godsire
• Godsire does not have summoning sickness

Steps

1. Activate Godsire by tapping it, creating an 8/8 Beast creature token
2. Activate Ashnod's Altar by sacrificing the Beast token, adding
3. The Beast dies, triggering Godsire, untapping Godsire
4. Repeat

Results

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