Retreat to Emeria, Haru, Hidden Talent, and Obscura Storefront

Prerequisites

• Retreat to Emeria on the battlefield
• Haru, Hidden Talent on the battlefield
• Obscura Storefront in hand

Steps

1. Play Obscura Storefront
2. When Obscura Storefront enters, it and Retreat to Emeria trigger
3. Resolve the Retreat to Emeria trigger, creating a 1/1 Kor Ally creature token
4. When the Kor Ally enters, Haru triggers, earthbending Obscura Storefront
5. Resolve the Obscura Storefront trigger from step 2, causing you to sacrifice it, search your library for an applicable land and put it onto the battlefield tapped, and gain 1 life
6. Haru triggers, returning Obscura Storefront from your graveyard to the battlefield
7. Repeat from step 2

Results

• Infinite ETB
• Infinite lifegain triggers
• Infinite lifegain
• Infinite creature tokens
• Near-infinite landfall triggers
• Infinite landfall triggers
• Put all basic Plains from your library onto the battlefield tapped
• Put all basic Islands from your library onto the battlefield tapped
• Put all basic Swamps from your library onto the battlefield tapped