Hi!
I tried to play for two hours yesterday and researched two cool spells to cast
on cities. One of them should increase food output by +1 permanently (I forgot the name).
However, selecting the spell in the spell book and then the city didn't work.
I got a red square marker on the map after selecting it, but it never turned green
no matter where I pointed it and could never cast it.
Also: is there no upkeep to these spells?