Kenrith, the Returned King, Earthcraft, Agatha of the Vile Cauldron, and Accursed Centaur

Prerequisites

• Kenrith, the Returned King on the battlefield
• Earthcraft on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Accursed Centaur in the graveyard

Steps

1. Activate a basic Swamp by tapping it, adding
2. Activate Kenrith's fifth ability by paying due to Agatha, returning Accursed Centaur from your graveyard to the battlefield
3. When Accursed Centaur enters, it triggers
4. Holding priority, activate Earthcraft by tapping Accursed Centaur, untapping the basic Swamp
5. Resolve the Accursed Centaur ability, sacrificing it
6. Repeat

Results

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