During the Main Phase: Activate 1 of these effects;
● Tribute 1 Reptile monster, then target 1 face-up card your opponent controls; destroy it.
● Ritual Summon 1 "Mitsurugi" Ritual Monster from your hand, by Tributing monsters you control whose total Levels equal or exceed its Level.
You can only activate 1 "Mitsurugi Magatama" per turn.