Retreat to Coralhelm, Scaled Herbalist, and Izzet Boilerworks

Prerequisites

• Retreat to Coralhelm on the battlefield
• Scaled Herbalist on the battlefield
• Izzet Boilerworks in hand
• Scaled Herbalist does not have summoning sickness

Steps

1. Activate Scaled Herbalist by tapping it, putting Izzet Boilerworks from your hand onto the battlefield
2. Izzet Boilerworks enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Izzet Boilerworks trigger, returning itself from the battlefield to your hand
4. Resolve the Retreat to Coralhelm trigger, untapping Scaled Herbalist
5. Repeat

Results

• Infinite landfall triggers