Forum:Mirage Tube!?

I don't get it.... Mirage Tube says it can only be activated when a monster you control is selected as an attack target.... But in that case, it would have to be during your opponent's turn right? Because that would be the only time when a monster you control COULD be selected as an attack target.

SO.... Why does it say that it can't be activated from the hand!? You can only activate face-down Spell/Trap Cards during your opponent's turn, not Spell/Trap Cards from your hand! Sounds kinda superfluous...