These arent as glossy as Japanese Glossy Promos by far, but they are best comparable to the backs of the Australian Red Logo Jungle Set cards
Essentially, it lets you destroy creatures or artifacts, and then their owner gets to play the same number of random artifacts or creatures from their library
The updates to trading and an exciting new set are just what Pokmon TCG Pocket needs to try and revive the title and bring players back to the game
As for its effect, its pretty lackluster
For reference, raw Base Set Charizard cards in Near Mint condition sell for hundreds of dollars
Similarly, had I on turn 1 attached a water energy to my benched Staryu instead of my active Goldeen, I would have been prevented from progressing when I ended the turn instead of when I attached the energy card