I think that the discard and deal three options are the most powerful of the six, while the remaining of the four are the flex choices depending on the situation
GXs are a generally more balanced type of card because rather than immediately play some huge basic card like a Charizard EX, you may have to spend a few turns to get out something like a Solgaleo GX or Alolan Ninetales GX
The tavern owner has everything you could need behind the bar, so here's some information to help you make your next move
the first deck needs blue mana to cast the adventure, and the second so you can cast this card from exile
Snow White, Lost in the Forest will remove up to two damage from a chosen character when she enters play, helping you keep your line-up of Dwarfs (who form a lovely panoramic bit of artwork when their cards are literally placed side-by-side) in play for as long as possible
To make them common enough to get to The Core quickly is a much bigger ask