But lets discuss gameplay, because that may even outdo the prior mentions
Adaptational Wimp: In the main TCG, effects that force your opponent to shuffle back their hand and draw a predetermined number of cards are extremely strong since the amount of draw power and consistency available in the original game means that you can effectively deny your opponent of a substantial number of resources that they likely gathered on a previous turn and plan to use later
Mid Game Remove your opponent's Characters with "OP04-055 Plague Rounds" and play medium-cost Characters like "OP04-054 Rokki" to set up the board
Honorable mention to The Pleasant Taxer, a concept card that lets you choose a mechanic and punish it
A 3-4 mana 1-for-1 removal spell just isnt that exciting, whether its unconditional, instant, or whatever
#3 Arceus VSTAR UR The Creator (~$90 / 10,000) Arceus VSTAR UR completes the Sinnoh creation myth alongside Dialga, Palkia, and Giratina