Mine

on $*:text:/^[!@](massv|massvoice)/Si:#: {
  if ($nick isvoice $chan) || ($nick isreg $chan) { halt }
  var %x = 1
  var %v $nick($chan,0,r)
  while (%x <= %v) { var %line $addtok(%line,$nick($chan,%x,r),32)
    inc %x
  }
  mode $chan $+(+,$str(v,%v)) %line
}
on $*:text:/^[!@](massdev|massdevoice)/Si:#: {
  if ($nick isvoice $chan) || ($nick isreg $chan) { halt }
  var %x = 1
  var %v $nick($chan,0,v)
  while (%x <= %v) { var %line $addtok(%line,$nick($chan,%x,v),32)
    inc %x
  }
  mode $chan $+(-,$str(v,%v)) %line
}