Ulamog's Dreadsire, Thornbite Staff, and Phyrexian Altar

Prerequisites

• Ulamog's Dreadsire on the battlefield
• Thornbite Staff on the battlefield
• Phyrexian Altar on the battlefield
• Thornbite Staff attached to Ulamog's Dreadsire
• Ulamog's Dreadsire does not have summoning sickness

Steps

1. Activate Ulamog's Dreadsire by tapping it, creating a 10/10 Eldrazi creature tokens
2. Activate Phyrexian Altar by sacrificing the Eldrazi token, adding one mana of any color
3. When the Eldrazi token dies, Ulamog's Dreadsire triggers, untapping Ulamog's Dreadsire
4. Repeat

Results

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