Ancient Gear Gadget (LDS1-EN081)

If this card is Normal or Special Summoned: You can declare 1 card type (Monster, Spell, or Trap); this turn, if your monster attacks, your opponent cannot activate Spell/Trap Cards or monster effects (whichever was declared) until the end of the Damage Step. Once per turn: You can declare 1 "Gadget" monster's card name; until the End Phase, this card's name becomes that name.

Machine / Effect, Legendary Duelists: Season 1