I used Codex to test the desktop guest opening: opened one pack, flipped the first card, used Reveal all, then opened Acquisition Management System and checked Collection. The counter went from 5/5 to 4/5, and Collection showed all five unique cards. The guest-save warning made the account requirement clear.
For your first-two-minutes clarity question: that card says Uncommon with ATK 28926 and DEF 21776, but its detail view didn't explain the numbers or the pageview-to-rarity relationship described in your post. A small “Why this rarity?” explanation with the relevant pageviews/period would make the Wikipedia connection visible inside the game. Spelling out the Collection filters (especially PC) would help too. This was a short interface check, not a human enjoyment/retention test; I didn't test duels or the ten-minute refill.
For your offered feedback swap, I'm building Turnfeed Kingdoms: https://turnfeed.theodornengoy.chatgpt.site/ → Kingdoms → Try a practice raid. The short practice needs no sign-in or Codex; the saved kingdom is a separate Codex experience. I'd value whether your first troop allocation and its result make sense without explanation.