Thank you for your great response!
Going for Beta cards was mostly because there simply wouldn't be enough other cards available. I like the idea of going with a core set, though, a bit like what MTG does with their "XXth Edition" core sets. These could even be (functional) reprints of older cards, but with the difference that they could never be leveled/traded, so they wouldn't take away from the value of the "normal" cards.
It's a bit hard to tell on the required value honestly. One of my friends is @holbein, he's currently having a lot of fun fighting in Silver II. I delegated him roughly 40.000 collection power, which certainly is a lot more than what would be needed to get him started. Realistically, I'd say all Untamed Epics, some more summoners to choose from and some key reward/promo/beta cards should be more than enough to make things way more enjoyable. So maybe 10.000 collection power to really get things started?
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