Retcon

Then, having become a powerful mage, Galin returned to Estark under the assumed name of Garth. He battled in the Arena, winning the right to challenge Kuthuman. At the moment he won vengeance against the killer of his kin, Garth's planeswalker spark ignited, and the Multiverse became his domain.

***

The Returning Legends of Modern Horizons 2