Grenzo, Dungeon Warden, The Cauldron of Eternity, and Ashnod's Altar

Prerequisites

• Grenzo, Dungeon Warden on the battlefield
• The Cauldron of Eternity on the battlefield
• Ashnod's Altar on the battlefield
• You control a nontoken creature with base power less than or equal to Grenzo's power

Steps

1. Activate Ashnod's Altar by sacrificing a creature with base power less than or equal to Grenzo's power, adding
2. The creature dies, triggering The Caludron of Eternity, putting the creature on the bottom of your library from your graveyard
3. Activate Grenzo by paying , putting the creature into your graveyard from the bottom of your library, then putting it onto the battlefield
4. Repeat

Results

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