Effect cannot be activated when destroyed by effect/flip-negating monsters.
Gives your opponents monster cards, if there are any from the 3 draws.
Hiro's Shadow Scout can be paired up with Warm Worm to mill your opponent's deck. Other support cards such as Conscription and Cup of Ace can also be considered. Ancient Telescope can be used when you want your opponent to discard some specific spell cards.
Your opponent draws cards / Reveals your opponent's hand / Your opponent discards