Kenrith, the Returned King, Earthcraft, Agatha of the Vile Cauldron, and Morgue Toad

Prerequisites

• Kenrith, the Returned King on the battlefield
• Earthcraft on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Morgue Toad 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 Morgue Toad from your graveyard to the battlefield
3. Activate Earthcraft by tapping Morgue Toad, untapping the basic Swamp
4. Activate Morgue Toad by sacrificing it
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite blue mana
• Infinite card draw for any number of players
• Infinite death triggers
• Infinite draw triggers for any number of players
• Infinite red mana
• Infinite sacrifice triggers