Reaping Willow, Phyrexian Altar, Zirda, the Dawnwaker, and Chaos Spewer

Prerequisites

• Reaping Willow on the battlefield
• Phyrexian Altar on the battlefield
• Zirda, the Dawnwaker on the battlefield
• Chaos Spewer in the graveyard
• available

Steps

1. Activate Reaping Willow by paying due to Zirda and removing two counters from it, returning Chaos Spewer from your graveyard to the battlefield
2. When Chaos Spewer enters, it triggers, putting two -1/-1 counters on Reaping Willow
3. Activate Phyrexian Altar by sacrificing Chaos Spewer, adding
4. Repeat

Results

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