Toph, the First Metalbender, Haru, Hidden Talent, Ravenous Intruder, and Leyline of Transformation

Prerequisites

• Toph, the First Metalbender on the battlefield
• Haru, Hidden Talent on the battlefield
• Ravenous Intruder on the battlefield
• Leyline of Transformation on the battlefield

Steps

1. Cast any artifact creature by paying its mana cost
2. When the artifact creature enters as an Ally due to Leyline of Transformation, Haru triggers, earthbending the artifact creature, as it's a land due to Toph
3. Activate Ravenous Intruder by sacrificing the artifact creature
4. When the creature dies, Haru triggers, returning the creature from your graveyard to the battlefield
5. When the creature enters as an Ally due to Leyline of Transformation, Haru triggers, earthbending the creature, as it's a land due to Toph
6. Resolve the Ravenous Intruder ability, giving Ravenous Intruder +2/+2 until end of turn
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
• Infinitely large creature until end of turn