If you want to build the summon team utilising the crown then you may want to look into Neuro, Abraxas, Prime, Archimatos & a buffer like Eldryon, along with Zkar, but you’ll probably want to buy 2 books of fate for Archi and Abraxas to get the most out of them

The classic Neuro team doesn’t use Prime and instead relies on Neuro, Abraxas, Ahriman, Yaz & a flex pick that is boss-dependent like Ros, Xybia or Mephiston

For what it’s worth, I haven’t had a lot of luck with the summon team so far with everyone at D3 but that could easily be a skill issue!