You don't need to attack with Cait Sith, Fortune Teller to gain the impulse card and free scry, but depending on the mana value of that top card, you may want to attack
You can't just pause the story whenever you want to
Your local game store will give you money on the spot, and trading card websites will have representatives to go through your collection and generally grade your cards in a week or less before giving you an offer
Use cards that grant a second attack step such as Karlach, Fury of Avernus to land more combat damage with your dwarves while generating more Treasures as they tap to attack
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There are some UI elements that people seem to find confusing and counterintuitive, but the bones are there for a client that both looks and plays well