Lord Skitter, Sewer King, Void Attendant, Pitiless Plunderer, and Xenograft

Prerequisites

• Lord Skitter, Sewer King on the battlefield
• Void Attendant on the battlefield
• Pitiless Plunderer on the battlefield
• Xenograft on the battlefield
• An opponent has a card in exile
• "Rat" chosen with Xenograft
• available

Steps

1. Activate Void Attendant by paying and putting a card an opponent owns from exile into their graveyard, creating a 1/1 Eldrazi Scion creature token
2. When the Eldrazi Scion enters the battlefield as a Rat due to Xenograft, Lord Skitter's first ability triggers, exiling a card from an opponent's graveyard
3. Activate the Eldrazi Scion by sacrificing it, adding
4. When the Eldrazi Scion dies, Pitiless Plunderer triggers, creating a Treasure artifact token
5. Activate the Treasure by tapping and sacrificing it, adding
6. Repeat

Results

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