I absolutely love these policies & the way they're instituted. Feels very balanced and fair. I was worried a culture bomb mod would be cheaty, but this is perfectly implemented. My favourite, although annoying, part is that the AI uses it against you too. Probably not intentional or directed, but it's a nice extra challenge nonetheless. Good work.

I have pushed a new update with new changes. I am looking forward to more feedback on these changes.

Yeah id definitely be down to use it if the gold maintenance was removed, or at least reduced to 1(then id at least consider using it on a country like poland).

Also, if you time it correctly, you do not have to actually activate the card at all time, just need it at the time the districts are finished. You can just build them, swap the card in, finish the districts and swap them out. That's one reason I put more penalty there.

I think Culture Bomb is very powerful and that's why not many Civ/Leader has it (and if they do, it only apply to a specific district). Remember that you can also steal tiles of other civ/city state as long as they don't have districts there.

I do think the penalty is a bit harsh, but can't really think any change that would justify the huge benefit. Probably removing the Gold maintenance penalty.

Id suggest either getting rid of the penalties, giving more benefits, or at least lessening the penalties. Culture bomb districts really isnt that powerful and those are some hefty penalties.