Kiora's Follower + Judge of Currents + Spark Double

Kiora's Follower

Judge of Currents

Spark Double

How it works

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

This clever little loop relies on Spark Double entering the battlefield as a copy of Kiora's Follower, successfully bypassing the legend rule to create a second untapper on your board. Once both creatures are ready to work, they simply take turns tapping to untap one another indefinitely, generating infinite activations. Meanwhile, the presence of Judge of Currents quietly watches the action, triggering every single time either Merfolk becomes tapped to flood your life total to infinity.