Scaretiller, Retreat to Coralhelm, and Obscura Storefront

Prerequisites

• Scaretiller on the battlefield
• Retreat to Coralhelm on the battlefield
• Obscura Storefront in hand
• Scaretiller is untapped
• You have a basic Island, Plains, or Swamp in library

Steps

1. Play Obscura Storefront
2. Obscura Storefront enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Obscura Storefront trigger, causing you to sacrifice it, then search your library for a basic Plains, Swamp or Island card, put it onto the battlefield tapped, and gain 1 life
4. The basic land enters the battlefield, triggering Retreat to Coralhelm, tapping Scaretiller
5. Scaretiller triggers, returning Obscura Storefront from your graveyard to the battlefield tapped
6. Obscura Storefront enters the battlefield, triggering itself and Retreat to Coralhelm
7. Resolve the Retreat to Coralhelm trigger, untapping Scaretiller
8. Repeat from step 3

Results

• Near-infinite landfall triggers
• Near-infinite lifegain
• Near-infinite lifegain triggers
• Put all basic Swamps, Islands, and Plains from your library onto the battlefield tapped