Cards like Pascal Rapunzels Companion, Stitch New Dog, Maleficent Sorceress, and more all have their place in certain competitive decks
Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard
The included 8 booster packs will expand your collection and give you more options for your decks
Buy a booster box if you want to open packs, draft, play sealed or build a broad collection
You can ramp up the impact with Ratadrabik of Urborg, even
In any deck that makes opponents dump cards, it becomes a snowballing threat thats impossible to ignore once it starts attacking