Leyline of Anticipation | Magic: The Gathering
Formats Leyline of Anticipation is Legal in
Official Oracle Text for Leyline of Anticipation
You may cast nonland cards as though they had flash. (You may cast them any time you could cast an instant.)
Official Rulings for Leyline of Anticipation
8/15/2010 : After all players have decided not to take any more mulligans, if the starting player has any Leylines in his or her hand, he or she may put any or all of them onto the battlefield. Then each other player in turn order may do the same.
8/15/2010 : Leylines that start the game on the battlefield aren't cast as spells. They can't be countered.
8/15/2010 : After each player has exercised his or her option to put Leylines onto the battlefield, the first turn of the game begins.