Kenrith, the Returned King, Earthcraft, Agatha of the Vile Cauldron, and Sidisi, Undead Vizier

Prerequisites

• Kenrith, the Returned King on the battlefield
• Earthcraft on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Sidisi, Undead Vizier 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 Sidisi from your graveyard to the battlefield
3. When Sidisi enters, its exploit ability triggers
4. Holding priority, activate Earthcraft by tapping Sidisi, untapping the basic Swamp
5. Resolve the Sidisi trigger, causing you to sacrifice it
6. Sidisi's second ability triggers, causing you to search your library for a card and put it into your hand
7. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite card draw
• Infinite death triggers
• Infinite sacrifice triggers