You can only activate this card name’s (2) effect once per turn.
(1) You can only control 1 face-up “Magical Musket – Bloody Crown”.
(2) During the Main Phase: You can Special Summon 1 “Magical Musket” monster from your hand, and if you do, and if your opponent’s Main Monster Zone in the same column the Special Summoned monster’s zone is unused, it cannot be used until the end of this turn.