Toph, the First Metalbender, Biotransference, and Hammerhead, Maggia Boss

Prerequisites

• Toph, the First Metalbender on the battlefield
• Biotransference on the battlefield
• Hammerhead, Maggia Boss 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 Hammerhead 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 Hammerhead ability, putting a +1/+1 counter on Hammerhead
7. Repeat from step 3

Results

• Infinite +1/+1 counters on a creature
• 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