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The quick answer is the sets that are about to rotate out of Standard tend to be the cheapest
This card alone is one of the best hand traps that has been printed in the past 15 years, as each time your opponent Special Summons a monster, you immediately draw 1 card
With 330 HP (with HP standing for Hit Points, representing the amount of health a Pokemon has before its Knocked Out, which happens when it reaches 0 or less HP), its pretty difficult to deal with this Charizard ex before it does some serious damage too
Where it can draw some cards and add in some value is with a creature like Bloodbraid Elf
Some effects do not specifically affect searching the library, but instead prohibit putting creatures onto the battlefield from the library