Lurking Roper, and Porcuparrot

Prerequisites

• Lurking Roper on the battlefield
• Porcuparrot on the battlefield

Steps

1. Give Lurking Roper lifelink
2. Activate Lurking Roper by tapping it, dealing 1 damage to any target and causing you to gain one life
3. Lurking Roper triggers, untapping it
4. Repeat from step 2

Results

• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers