Brago, King Eternal probably still wears the crown when it comes to commanders for this archetype, letting you flicker your whole board every turn in most cases
Check for the 1st Edition stamp on the lower left, then whether a Base Set card is Shadowless (no drop shadow on the art box) or Unlimited, whether it is holo, its rarity symbol, and its condition
I think your description is bang-on: it has slightly more gloss compared to other new back cards (I compared it via a yokohama pikachu back and a munch scream psyduck back), but compared to a JR glossy mew the gloss is not even close that a true glossy card
full-fledged fellows
The reverse-foil pattern is also different than it was from previous sets, although this tends to change rather often, so its not particularly surprising
As ever I have presented a list chock full of the most synergy options so as to showcase the range of the less commonly seen cards