Kenrith, the Returned King, Great Whale, and Altar of Dementia

Prerequisites

• Kenrith, the Returned King in hand or on the battlefield or in the command zone
• Great Whale in the graveyard
• Altar of Dementia on the battlefield
• You control up to seven lands that can tap to produce at least

Steps

1. Activate up to seven lands by tapping them, adding at least
2. Activate Kenrith's fifth ability by paying , returning Great Whale from your graveyard to the battlefield
3. When Great Whale enters the battlefield, it triggers, untapping up to seven lands
4. Activate Altar of Dementia by sacrificing Great Whale, causing target player to mill cards equal to Great Whale's power
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite untap of lands you control
• Infinite mana lands you control can produce