Categorization : Categorize cards within the list for easier navigation, such as by type, attribute, or series
X in any grass type Pokemon deck just for its Poke-Power, because with Big Growth every Pokemon you have will seem like it has 40 or more hp to it, and since grass Pokemon usually have higher hp's than other Pokemon, one powerful grass Pokemon with a high hp should last quite awhile with Tangrowth Lv
Why exactly this mechanic didn't get the success that it possibly could've is a bit harder to figure out, but it could be because most people just simply didn't care when there's so few cards that use it, and none of which being particularly powerful enough to leave a mark on the game
Thats why Teysa tends to be the favored option for the strategy
Musharna's second move is called Dream Dance, for two energy cards, one each of psychic and colorless, this move does 30 damage and it puts both Musharna and the defending Pokemon to sleep