Kenrith, the Returned King, Agatha of the Vile Cauldron, and Blood Pet

Prerequisites

• Kenrith, the Returned King on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Blood Pet in the graveyard
• available

Steps

1. Activate Kenrith's fifth ability by paying due to Agatha, returning Blood Pet from your graveyard to the battlefield
2. Activate Blood Pet by sacrificing it, adding
3. Repeat

Results

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