Toph, the First Metalbender, Altar of Dementia, and Mycosynth Lattice

Prerequisites

• Toph, the First Metalbender on the battlefield
• Altar of Dementia on the battlefield
• Mycosynth Lattice on the battlefield

Steps

1. Cast the earthbend creature by paying its mana cost
2. When the creature enters, it triggers, earthbending the creature, as it's an artifact due to Mycosynth Lattice, thus making it also a land due to Toph
3. Activate Altar of Dementia by sacrificing the earthbent creature
4. When the creature dies, it triggers, returning it from your graveyard to the battlefield tapped
5. When the creature enters, it triggers, earthbending the creature, as it's an artifact due to Mycosynth Lattice, thus making it also a land due to Toph
6. Resolve the Altar of Dementia ability, causing a player to mill card(s)
7. Repeat from step 3

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers
• Infinite mill
• Infinite self-mill