In competitive circles, cards like Arceus VSTAR or Mega Mewtwo EX are often cited for their game-breaking abilities and historical dominance
Long story short: Banned in Modern, banned in Legacy, and a very popular card-draw engine in the formats it's still legal in
Being playable in any deck but only desirable in decks playing enough creatures to reliably crew it means that an aggressive player will generally end up with the Copter in their deck, and the power, evasion, and card selection that the card offers tends to give any aggressive deck a real shot in the arm
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(The thief and the assassin attack characters , but if a specific player keeps pulling the same character, the thief or assassin player can then de facto attack that player, which has some very nice advantages.) Other characters create innate balance too, such as the thief, who will act as a balance to someone hoarding gold, the magician, who will act as a balance to someone hoarding cards, and the warlord, who will act as a balance to someone who's out in front on districts
2000 Pokemon Topps Chrome Series 1 Tekno Pikachu #25 PSA 10 Recently Sold for $3,500 [Source] This is by far the most valuable Topps Pikachu card, and one of only 6 PSA 10s that exist