Golden Demise

Golden Demise affects only creatures that are on the battlefield at the time it resolves. Creatures that enter the battlefield later in the turn won’t get -2/-2. Similarly, if you have the city’s blessing, creatures that come under your opponents’ control later in the turn won’t get -2/-2.

If you control ten permanents but don’t control a permanent or resolving spell with ascend, you don’t get the city’s blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you won’t have the city’s blessing and the spell will affect creatures you control.

If you cast a spell with ascend, you don’t get the city’s blessing until it resolves. Players may respond to that spell by trying to change whether you get the city’s blessing.