Cast Seasons Past by paying ({4} magic symbol) ({G} magic symbol) ({G} magic symbol) , returning Personal Tutor, Time Walk, and any number of cards with different mana costs to your hand and putting Seasons Past on the bottom of your library.
Cast Personal Tutor by paying ({U} magic symbol) , putting Seasons Past on top of your library.
Cast Time Walk by paying ({1} magic symbol) ({U} magic symbol) , granting you an extra turn.
In the draw step of your next extra turn, draw Personal Tutor.