Use tools that show price history charts to understand if a card's value is trending up, down, or holding steady
People seem to forget that for a couple weeks in the Asmor era of the format people just stopped playing Crashcade because of this
Its enough to make you wonder where else you could put your money
Its highlight, Marowak EX, is a powerful card well-suited to both experienced and beginner players, making it ideal for competitive play
It is basically an embedded Computer Search in a Pokmon, without the "paying" the cost of anything in hand, discarding or otherwise, to look for something in your deck - not to mention this is a Pokmon with zero retreat cost
Sleeper's Robe) and other "similar but slightly worse" type of cards in the deck and that will give you room to add a few more powerful generic spells like Fierce Guardianship, Mana Drain, Swan Song, Rhystic Study, and Cyclonic Rift