Cards in your hand could be hand-traps, monsters you just haven't played yet, or Spells you haven't played yet
Luffy is the main protagonist of the One Piece series, and as such, any card featuring him automatically carries significant value in the One Piece community
My wife works full time
Lulu used the effect of "Independent Nightingale" to inflict damage to Yuya and then attacked him directly but Yuya activated two copies of "The Phantom Knights of Lost Vambrace" to protect his LP and weaken "Independent Nightingale", and to her shock and anger they Xyz Summoned "The Phantom Knights of Cursed Javelin" and weakened her monster during her turn
Good counterfeits are already here, and, so long as it is profitable to make them, they will remain as a serious issue in our community
But oftentimes, it will be a combination of these things, giving you the best chance to win a duel