Zinnia, Valley's Voice | Timestream Navigator

Cards

({3} magic symbol) ({U} magic symbol) available the first turn, with ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) each following turn available.

Cast TImestream Navigator by paying ({1} magic symbol) ({U} magic symbol) , plus an additional ({2} magic symbol) for its offspring cost.
If you control ten or more permanents and don't have the city's blessing,
Timestream Navigator gives you the city's blessing.
When
Timestream Navigator enters the battlefield, it and
Cloudstone Curio trigger.
Resolve the
Cloudstone Curio trigger, choosing not to return anything to your hand.
Resolve the
Timestream Navigator trigger, creating a token copy of it that is 1/1.
If you control ten or more permanents and don't have the city's blessing, the
Timestream Navigator token gives you the city's blessing.
When the
Timestream Navigator token enters the battlefield,
Cloudstone Curio triggers, returning the nontoken
Timestream Navigator from the battlefield to your hand.
During your next turn, repeat steps 1 through 7 one additional time.
Activate the oldest
Timestream Navigator token by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
Repeat from step 8.

This combo has been estimated to be Ruthless (Bracket 4+).