Bandai notes the prize cards can all be combined with the designated Starter Decks, which suggests they are built to slot into these shells rather than existing as pure alt art collectibles
As a bonus, if you can perform Kashtira plays, it is generally better not to consolidate into Shangri-Ira, but since Kashtira names accumulate in the GY, even if you have no Birth or Theosis, if you can recover the Tearlaments Kashtira or Scareclaw Kashtira used as starters via Riseheart banishing Theosis, you can summon Fenrir from Shangri-Ira on the opponent's turn
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This monster gives you not one, but two effects to take advantage of when flipped
How can I tell if my Pokmon cards are worth selling individually
The other 2 Ultra Rares per pack (4 per box) are a new, colorful treat