Trostani, Selesnya's Voice, Lurking Roper, and Presence of Gond

Prerequisites

• Trostani, Selesnya's Voice on the battlefield
• Lurking Roper on the battlefield
• Presence of Gond on the battlefield

Steps

1. Activate Lurking Roper by tapping it, creating a 1/1 Elf Warrior creature token
2. The Elf Warrior enters the battlefield, triggering Trostani, causing you to gain life equal to the Elf Warrior's toughness
3. Lurking Roper triggers, untapping itself
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers