The Boy in the Iceberg - Dark Depths (Borderless) - Avatar: The Last Airbender: Eternal-Legal

The Boy in the Iceberg enters with ten ice counters on it.
3: Remove an ice counter from The Boy in the Iceberg.
When The Boy in the Iceberg has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.