Cast Part the Waterveil by paying ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and exile Part the Waterveil.
Activate Isochron Scepter by paying ({2} magic symbol) and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
Resolve Pull from Eternity, putting Part the Waterveil into your graveyard from exile.
Move to your next turn.
Activate Dralnu by tapping it, giving Part the Waterveil flashback until end of turn.
Cast Part the Waterveil from your graveyard by paying ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and exile Part the Waterveil.