There is currently only one 5-cost item in the game, introduced in this set, 005-167
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Decks would rarely cast it (or Stinkweed Imp, which served as extra dredge insurance), and instead discarded it to fly through their library as they put more and more Golgari Grave-Trolls in their graveyard, milling six more cards at a time whenever they went to draw
(E.g.: If "Cocoon of Ultra Evolution" Special Summons a monster, players can activate a card effect such as "Floodgate Trap Hole" in response to the Special Summon.) The Skill on a Skill Card can only be activated once per Duel unless it has specific instructions or flips itself face-down
For an example of what Topps 1951 cards looked like, take a look below: For that series only, it was framed to be more like a game (a trading card game, perhaps?) , and each players cards could affect the game, such as drawing a strike or a ball card would mean your pitcher threw a strike or a ball, etc
We have, of course, seen cards with abilities like these played consistently in competitive play, so its quite possible Pluto will see play as well