Its useful to know how far youre thinking about deviating in power level when taking a card that works with your current plan in some way, but at least in the beginning, a straight ranking system can go a long way
X can't be 0. Activate only during your turn
Then, later in the game, it will give you card advantage and selection at the end of your opponent's turns
Meanwhile, Dark Head hits your opponents Pokemon with 160 damage if it is Asleep
cards can, and have, sold for higher prices if graded or particularly rare
The Energy cards were some of the cheapest prizes on offer and, so, back in the day, it was really easy to get quite a few, and yet now it's quite the opposite, and they stand as some of the most stunning yet valuable Energy cards to this day