Kiora's Follower, Judge of Currents, and Undercover Operative

Prerequisites

• Kiora's Follower on the battlefield
• Judge of Currents on the battlefield
• Undercover Operative on the battlefield
• Undercover Operative is a copy of Kiora's Follower
• Kiora's Follower and Undercover Operative do not have summoning sickness

Steps

1. Activate Kiora's Follower by tapping it
2. When Kiora's Follower becomes tapped, Judge of Currents triggers, causing you to gain 1 life
3. Resolve Kiora's Follower's ability from step 1, untapping Undercover Operative
4. Activate Undercover Operative by tapping it
5. When Undercover Operative becomes tapped, Judge of Currents triggers, causing you to gain 1 life
6. Resolve Undercover Operative's ability from step 4, untapping Kiora's Follower
7. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers