Toph, the First Metalbender, Zuran Orb, and Biotransference

Prerequisites

• Toph, the First Metalbender on the battlefield
• Zuran Orb on the battlefield
• Biotransference 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 Biotransference, thus making it also a land due to Toph
3. Activate Zuran Orb 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 Biotransference, thus making it also a land due to Toph
6. Resolve the Zuran Orb ability, causing you to gain 2 life
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 lifegain
• Infinite lifegain triggers