If you control no monsters: You can Special Summon this card from your hand. If this card is Normal or Special Summoned: You can look at your opponent's hand, then banish 1 card from it face-down until the End Phase. If a card(s) your opponent owns is banished face-down (except during the Damage Step): You can target 1 face-up card your opponent controls; banish it. You can only use each effect of "Astryx Vanguard" once per turn.