Kiora's Follower, Judge of Currents, and Gigantoplasm

Prerequisites

• Kiora's Follower on the battlefield
• Judge of Currents on the battlefield
• Gigantoplasm on the battlefield
• Gigantoplasm is a copy of Kiora's Follower
• Kiora's Follower and Gigantoplasm 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 Gigantoplasm
4. Activate Gigantoplasm by tapping it
5. When Gigantoplasm becomes tapped, Judge of Currents triggers, causing you to gain 1 life
6. Resolve Gigantoplasm's ability from step 4, untapping Kiora's Follower
7. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers