Squee, the Immortal, Pawn of Ulamog, Pitiless Plunderer, and Yahenni, Undying Partisan

Prerequisites

• Squee, the Immortal on the battlefield
• Pawn of Ulamog on the battlefield
• Pitiless Plunderer on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Squee
2. When Squee dies, Pawn of Ulamog and Pitiless Plunderer trigger, creating a 0/1 Eldrazi Spawn creature token and a Treasure token
3. Resolve the Yahenni ability
4. Activate the Eldrazi Spawn by sacrificing it, adding
5. When the Eldrazi Spawn dies, Pitiless Plunderer triggers, creating a Treasure token
6. Activate two Treasures by tapping and sacrificing them, adding
7. Cast Squee from your graveyard by paying
8. Repeat

Results

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