During either player's turn, you can activate "Magical Musket" Spell/Trap Cards from your hand. If a Spell/Trap Card is activated in this card's column (except during the Damage Step): You can add 1 "Magical Musket" card from your Deck to your hand, but not a card with the same name as that activated card. You can only use this effect of "Magical Musketeer Caspar" once per turn.