Is Second Sight legal in Standard, Modern, and Commander?

Second Sight is legal in: Modern, Legacy, Vintage, Commander.

Second Sight

Q: What type of card is Second Sight?

Second Sight is an Instant. Its oracle text reads: "Choose one — • Look at the top five cards of target opponent's library, then put them back in any order. • Look at the top five cards of your library, then put them back in any order. Entwine {U} (Choose both if you pay the entwine cost.)"