Reaping Willow, Phyrexian Altar, Plague Belcher, and Agatha of the Vile Cauldron

Prerequisites

• Reaping Willow on the battlefield
• Phyrexian Altar on the battlefield
• Plague Belcher in the graveyard
• Agatha of the Vile Cauldron on the battlefield
• available

Steps

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

Results

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