Holding priority, activate Drafna's second ability by paying ({3} magic symbol) and tapping it, copying Timestream Navigator.
When the Timestream Navigators enter the battlefield, if you do not have the city's blessing, they trigger, giving you the city's blessing.
Activate Dynaheir by tapping it, copying the next ability you activate this turn that costs four or more mana to activate.
Activate the Timestream Navigator token by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , tapping it and putting it on the bottom of your library.
Resolve both Timestream Navigator abilities, causing you to take two extra turns after this one.
Move to your first extra turn.
Activate Drafna's first ability by paying ({1} magic symbol) ({U} magic symbol) , returning the nontoken Timestream Navigator from the battlefield to your hand.