At the beginning of your upkeep, Clearwater Goblet triggers, causing you to gain at least three life.
At the beginning of your draw step, Maralen triggers, causing you to lose three life, then search your library for Nexus of Fate and put it into your hand.
Cast Nexus of Fate by paying ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and shuflle Nexus of Fate into your library.