Is Supreme Will legal in Standard, Modern, and Commander?

Supreme Will is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Supreme Will?

Supreme Will is an Instant. Its oracle text reads: "Choose one — • Counter target spell unless its controller pays {3}. • Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order."