Even if youre feeling more honest, having 10+ mana to sink into your next turn is likely enough to end things anyway
The rarer cards do cost more Pack Points (up to 2,500 Pack Points) so its not a viable way to master the set unless you have 1 or 2 cards left, however if youre looking for a card to complete a deck (such as Gardevoir or Hypno which are popular at the moment), it can be a quick way of doing so
However, it can make the game more enjoyable and visually appealing
These consist of Duel Puzzles (winning a Duel given certain cards on the board and in hand), Themed Duels (full Duels based on a certain theme for building your Deck), and Survival Duels (see how many Duels you can win in a row with your Life Points carrying over from Duel to Duel)
I think these would make amazing gifts for Pokmon fans, especially adult collectors, nature lovers, science students, or anyone who enjoys creative hobbies