"Oboro": "Choose up to one of your opponent's rear-guards, [Stand] and dominate it, until end of turn, it gets [Power]+4000, and attacks your opponent's OTHER UNIT." Maguntenbu: "Choose one of your opponent's rear-guards, [Stand] and dominate it, it attacks your opponent's OTHER UNIT, and retire that dominated unit at the end of that battle." Units are either Rearguards or Vanguards, so they're are both valid targets if not specified.
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Dominated units can swing at the back row?
"Oboro": "Choose up to one of your opponent's rear-guards, [Stand] and dominate it, until end of turn, it gets [Power]+4000, and attacks your opponent's OTHER UNIT."
Maguntenbu: "Choose one of your opponent's rear-guards, [Stand] and dominate it, it attacks your opponent's OTHER UNIT, and retire that dominated unit at the end of that battle."
Units are either Rearguards or Vanguards, so they're are both valid targets if not specified.