Is Study Hall legal in Standard, Modern, and Commander?

Study Hall is legal in: Legacy, Vintage, Commander, Pauper.

Study Hall

Q: What type of card is Study Hall?

Study Hall is a Land. Its oracle text reads: "{T}: Add {C}. {1}, {T}: Add one mana of any color. When you spend this mana to cast your commander, scry X, where X is the number of times it's been cast from the command zone this game."

Land

: Add .

, : Add one mana of any color. When you spend this mana to cast your commander, scry X, where X is the number of times it's been cast from the command zone this game.