There's far more to her character than this, of course, however I lack the knowledge and understanding to explain it better
Tamatoa, Happy as a Clam is also just a strong card in general for allowing you to get items directly from your discard back into your hand and play them for free when he quests
While Ruby/Amethyst probably has the advantage realistically in that matchup, its not by a lot and a strong Sapphire/Steel player can certainly overcome Ruby/Amethysts tools either by gaining more cards in hand through superior draw support, or discarding that decks key cards via A Whole New World
If you are relatively new, or are just ripping open booster packs for the first time, you may want to cover all of the rarities of the cards first
A character card is a card that can be played onto the board and has inherent stats, an offensive stat called Strength , a defensive stat called Willpower and a Lore value
The draw was still replaced