command /mugenAssassin:
   description: 無限アサシンもらえる
   permission: mugen.asasin
   trigger:
      add feather named "&e無限に飛べるよ" to player

on rightclick holding a feather:
   player has permission "mugen.asasin"
   player is holding a feather named "&e無限に飛べるよ"
   push the player in front at speed 1.6
   play raw sound "mob.wither.shoot" at player with pitch 1