Well, possibly you can define an automatic benefit for that ally? IIRC, some heroes provide allies with benefits in some cases. Possibly the same mechanism can be reversed to provide these benefits automatically from certain civs to yourself? Nevertheless, it sounds rather complex.

Пользуйтесь удобной услугой: доставка алкоголя москва круглосуточно. Большинство сервисов требуют подтверждение возраста при оформлении заказа и при его получении.

I'm not sure, but I don't think we have anything for that; maybe something related to technology would have a similar effect, but I have no idea how it could be done.

Like before after shots of a gym transformation...

Anybody know how I could make it so you can't get a unit unless you have a certain ally?