Timestream Navigator enters the battlefield, triggering Inalla; pay ({1} magic symbol) to make a token copy of Timestream Navigator with haste.
Activate the token Timestream Navigator by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
Activate Erratic Portal by paying ({1} magic symbol) and tapping it, returning the original Timestream Navigator to your hand.