Kenrith, the Returned King, Relic of Legends, Agatha of the Vile Cauldron, and Lena, Selfless Champion

Prerequisites

• Kenrith, the Returned King on the battlefield
• Relic of Legends on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Lena, Selfless Champion in the graveyard
• available

Steps

1. Activate Kenrith's fifth ability by paying due to Agatha, returning Lena from your graveyard to the battlefield
2. Activate Relic of Legends' second ability by tapping Lena, adding
3. Activate Lena by sacrificing it
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite creature tokens