Sure, Katara, Waterbending Master is a mere 1/3, but blue decks already hold up interaction on opponents turns anyway, so accumulating experience is the easy part
Tell a Visual Story Try themed layouts like evolution lines, color sets, or trainer + Pokmon duos
It might be better to play such cards over making a clumsy splash but they are not things you want
from the deck, its effect can be activated by scaling a pendulum scale
Again, you should immerse yourself in the community: watch videos, follow forums, ask around, and maybe even get into the game yourself so youll have a rough idea of what a card should be worth
Drawing cards is obviously great but doing so later in the game, even if cheaply, is less what you need