I have a rather large project I need to update which uses MyriadPro-Black.
This font is only available for web design according to Typekit.
I'm sorry that you ran into trouble with this. As you noted, not all fonts at Typekit are available for sync use. For now, font variations that aren't available via Typekit can be purchased separately.
Adobe fonts are available from our partner, Fontspring:
We are continuing to license fonts for sync as we move forward as well. I hope that this helps; let me know if you have any other questions. Best,
I can pick it up reasonably from the site.