(On a later turn, you may cast it for its foretell cost, even if this creature has left the battlefield.) Because the card in exile becomes foretold, you can look at it in exile
Due to this inflexibility, my thought then becomes this card is a sideboard card, and probably a stellar one at that in the right matchup
So if you want a deeper look at Strixhaven and to learn what's been happening with Angrath's family, I encourage you to go read the book
You can go Voltron (and that's likely where most people will go), but you're in colors that support pillow fort, prison/stax, or even just plain stompy
Beyond its primary function, it offers a range of features that can help you manage your collection more efficiently
He functions perfectly well all on his own, milling cards into graveyards that could potentially make him larger and letting you cast those cards every turn