When you go to drop your own Dockside Extortionist you are either forcing your opponents to sacrifice their Treasure tokens early in response, or they will be giving you a ton of Treasure tokens of your own
Paired with Ruby Medallion, it effectively gives extra copies of reducers, so its easier to chain rituals and finish with Past in Flames, Wish, Grapeshot, or Empty the Warrens
While this is mostly a sideboard card since its other mode is very niche and rare to use, its very effective against decks that have the nasty tendency of flooding the board with small flying creature tokens
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Still, if you were playing Pokmon TCG Pocket shortly after this update, there was one last for Trade Tokens