Spawnsire of Ulamog, and Illusionist's Bracers

Prerequisites

• Spawnsire of Ulamog on the battlefield
• Illusionist's Bracers on the battlefield
• Illusionist's Bracers is attached to Spawnsire of Ulamog
• available

Steps

1. Activate Spawnsire of Ulamog's first ability by paying
2. Illusionist's Bracers triggers, copying Spawnsire of Ulamog's first ability
3. Resolve the copy of Spawnsire of Ulamog's first ability and Spawnsire of Ulamog's first ability, creating four Eldrazi Spawn tokens with "Sacrifice this creature: add to your mana pool"
4. Activate the four Eldrazi Spawn tokens's abilites by sacrificing the Eldrazi Spawn, adding
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers