AscendAscend on an instant or sorcery spell represents a spell ability. It means “If you control ten or more permanents and you don’t have the city’s blessing, you get the city’s blessing for the rest of the game.”
Ascend on a permanent represents a static ability. It means “Any time you control ten or more permanents and you don’t have the city’s blessing, you get the city’s blessing for the rest of the game.”
The city’s blessing is a designation that has no rules meaning other than to act as a marker that other rules and effects can identify. Any number of players may have the city’s blessing at the same time.
After a player gets the city’s blessing, continuous effects are reapplied before the game checks to see if the game state or preceding events have matched any trigger conditions. (CR 702.131) (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
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SacrificeTo sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect this action. (CR 701.21) this artifact: You gain 3 life and draw a card.
ActivateTo activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if they have priority. See rule 602, “Activating Activated Abilities.” (CR 701.2) only if you have the city's blessing.