Lurking Roper, Splinter Twin, and Prosperous Innkeeper

Prerequisites

• Lurking Roper on the battlefield
• Splinter Twin on the battlefield
• Prosperous Innkeeper on the battlefield
• Lurking Roper does not have summoning sickness
• Splinter Twin attached to Lurking Roper

Steps

1. Activate Lurking Roper by tapping it, creating a token copy of itself
2. When the Lurking Roper token enters the battlefield, Prosperous Innkeeper's second ability triggers, causing you to gain 1 life
3. Each Lurking Roper you control triggers, untapping themselves
4. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers