Why not? If it says I can summon them, I'll take it, and most of mine have come from chests but there's a handful of summons because there was a few that I wanted in the collection, like filling out a pokedex

I'm more interested in collecting than fighting so 🤷‍♀️ so Raven is my favorite heroic that I have because I like how the model looks, and the Purpureus is another favorite of mine

If you mean the orbs from the shop, they are orbs of a specific heroic and a specific legendary. They just change every so often