Deeproot Pilgrimage + Kiora's Follower + Quicksilver Gargantuan

Deeproot Pilgrimage

Kiora's Follower

Quicksilver Gargantuan

How it works

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