Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
Creatures you control get +1/+1 until end of turn. If you have the city's blessing, those creatures get +2/+2 until end of turn instead.
Pride of Conquerors affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn wonâ€™t get a bonus.
Once you have the cityâ€™s blessing, you have it for the rest of the game, even if you lose control of some or all of your permanents. The cityâ€™s blessing isnâ€™t a permanent itself and canâ€™t be removed by any effect.
If your tenth permanent enters the battlefield and then a permanent leaves the battlefield immediately afterwards (most likely due to the â€œLegend Ruleâ€ or due to being a creature with 0 toughness), you get the cityâ€™s blessing before it leaves the battlefield.
If you control ten permanents but donâ€™t control a permanent or resolving spell with ascend, you donâ€™t get the cityâ€™s blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you wonâ€™t have the cityâ€™s blessing and the spell will affect creatures you control.
If you cast a spell with ascend, you donâ€™t get the cityâ€™s blessing until it resolves. Players may respond to that spell by trying to change whether you get the cityâ€™s blessing.
How Pride of Conquerors affects your creatures is determined at the time it resolves. If you donâ€™t get the cityâ€™s blessing until later in the turn, your creatures still only get +1/+1.
A permanent is any object on the battlefield, including tokens and lands. Spells and emblems arenâ€™t permanents.