These add certain cards to the Wonder Pick section of the game as separate packs to choose from, which either cost nothing or two Wonder Stamina
place them on top of your Deck in any order
That's not a terrific cost ratio in and of itself, but for just one more Energy, Blizzard deals 80 damage to your opponent's Active Pokemon, and 10 damage to each of your opponent's Benched Pokemon
Possible packs include Scarlet & Violet sets (Surging Sparks, Prismatic Evolutions, Paldean Fates, 151), Sword & Shield sets, Sun & Moon, and potentially vintage WOTC packs depending on availability
This has already demonstrated how high it can go and I plan to buy a lot of copies of this for personal use before I even start to speculate
Flip Cards Face-Up and Begin Once every step has been completed, flip all your face-down Pokmon up before the first player takes their turn