Lurking Roper, Resplendent Mentor, and Painter's Servant

Prerequisites

• Lurking Roper on the battlefield
• Resplendent Mentor on the battlefield
• Painter's Servant on the battlefield
• Lurking Roper does not have summoning sickness
• "White" chosen with Painter's Servant

Steps

1. Activate Lurking Roper by tapping it, causing you to gain 1 life
2. Lurking Roper triggers, untapping itself
3. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers