Deeproot Pilgrimage + Kiora's Follower + Altered Ego

Prerequisites

Altered Ego on the battlefield as a copy of Kiora's Follower. Kiora's Follower and Altered Ego do not have summoning sickness.

Steps

1. Activate Kiora's Follower by tapping it, targeting Altered Ego.
2. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
3. Resolve the Kiora's Follower ability, untapping Altered Ego.
4. Activate Altered Ego by tapping it, targeting Kiora's Follower.
5. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
6. Resolve the Altered Ego ability, untapping Kiora's Follower.
7. Repeat.