Reassembling Skeleton, Phyrexian Altar, and Sifter of Skulls

Prerequisites

• Reassembling Skeleton on the battlefield
• Phyrexian Altar on the battlefield
• Sifter of Skulls on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Reassembling Skeleton, adding Sifter of Skulls triggers, creating a 1/1 Eldrazi Scion creature token with "Sacrifice this creature: add " Activate the Eldrazi Scion by sacrificing it, adding
2. Activate Reassembling Skeleton by paying , returning it from your graveyard to the battlefield tapped
3. Repeat

Results

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