Cast Seasons Past by paying ({4} magic symbol) ({G} magic symbol) ({G} magic symbol) , returning Temporal Manipulation, Scheming Symmetry, and any number of cards with different mana costs to your hand and putting Seasons Past on the bottom of your library.
Cast Scheming Symmetry by paying ({B} magic symbol) , putting Seasons Past on top of your library and allowing target player to put the card of their choice in their library on top of their library.
Cast Temporal Manipulation by paying ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) , granting you an extra turn.
In the draw step of your next extra turn, draw Seasons Past.