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This is intentional as well, because the flavour text notes that these titular brass claws are 'among the least feared weapons'

Anytime you tap down an untapped creature one of your opponents control, you can pay one mana

It encourages aggressive use of the combat phase even from controlling decks, creates interesting mind games, and opens up avenues to play cards which would not be close to Constructed otherwise

Deadly Disguise Decklist Deadly Disguise themes and archetypes The primary theme of Deadly Disguise is disguise

You'll want to keep him as safe as possible with Bodyguards, Locations, and characters that grant him Ward or Evasive because if your opponent can't get rid of him quickly, you can run away with the game.