If your aim is to build a complete set or you simply love the process of opening packs, then buying booster packs (or booster boxes) is a fun way to go
With a reliable way to bounce or flicker Elrond, you can keep stealing or pumping up your creatures each turn
Release Date and Set Size According to The Pokmon Companys official set page, Shiny Treasure ex launched in Japan on December 1, 2023 as a High Class Pack in the Scarlet & Violet series
Cards like Nexus of Fate, Korvold, Fae-Cursed King, and Kenrith, the Returned King, some of which were only available in foil, went against what WotC aimed for with unique cards as promos and impacted tournament integrity due to the warping of many foil cards
The counter gain seems minuscule at +2/+2 but if you are running a lot of Spirits and Arcanes its basically a free effect