devtrackers.gg
Narfi, Egon, and Harald will be available for purchase in the deckbuilder (along with other KHM showcase styles) when Strixhaven releases.
(These three were locked off for an event that ultimately had to be pulled at the last minute. :( Sorry for the frustration.)
Thank you for updating us on what happened to those styles.
If I may ask, are there any plans to make the Vorinclex showcase viking style available, or to bring the borderless mythic foretell cards to Arena in the future?
Showcase Vorinclex is scheduled to also be available with the Strixhaven release.
The borderless Foretell cards are not scheduled to be on Arena. I think some early published content may have gotten wires crossed between these cards and borderless planeswalkers and Pathways.