Bursti's effect means Gullveig can get you any Nordic monster(s) and Nordic Relic you want from the Deck, plus another Nordic monster from the GY
In the TCG artwork, that symbol is glazed over to make it look just like any other glassy stone
Following on from the Paldea Evolved set, the Scarlet and Violet era of the Pokmon TCG has received another expansion in the form of Obsidian Flames
Your main get-go will primarily be boss rush, dropping cards like Archfiend's own Empress and First Lord of Horror, Xyz such as Contellar Ptolemy M7, and occasionally other options depending on your build, which Avatar and Spy let you adjust accordingly
This evolution has kept Tyranitar relevant across multiple game releases, allowing it to maintain a strong presence through Generations II to VIII
The promo cards are a way for fans to get even more collectible items and to want to continue their search to find the rare cards in their decks