You arent guaranteed to win a promo pack for each battle challenge you win: The promo card packs are listed in the game as a chance reward for every single battle
Two AR cards per box is the modern standard across Scarlet & Violet sets, though some boxes pull 1 and some pull 3
Cathartic Pyre What is it with the commons in this set
At the cost of 2000 LP, Injection Fairy Lily's ATK would increase by a whopping 3000 to 3400, meaning that it could beat just about everything in the game in battle, including the legendary Blue-Eyes, without the aid of Equip Spell Cards
You can only use this effect of Space bug #2 once per turn
Inferno Onrush only needs three Energy compared to the five Charizard ex needs to use Crimson Storm two turns in a row, and Arcanine ex is a Stage 1 Pokemon, so you only need to evolve once