I’ve got 19 total (16 unique). According to the app, I’ve opened 298 booster packs with stamina. Looking at the opening rates, I think there’s ~3.84% chance of pulling a ☆☆+ in a pack - I should only have 11/12 cards, so I’m doing better than expected, but I got some from wonder picks.
Having duplicates is a bit annoying - I’ve got 2 Sabrinas, which is actually nice because I can use them both in a deck, but I’ve got 3 immersive Charizards. If I could trade one for an immersive Celebi, it would be fine, but that won’t happen.