I've read all your posts in this thread, and they're all variations on the theme "You can MV it" and "It's only super awesome if you also depop". Responses to those arguments are "MV is only a theoretical counter, because in practice it's infeasible" and "The op doesn't have to give you a tripple crown to be overpowered, because OP is about benefit vs costs".I see you, like Palem, don't read my posts either :(
The MV argument is silly, because it's ridiculously costly and ineffective to the degree where it's not really a counter at all. Ergo the MV argument is useless.
Chastity is both easy to cast and low cost in runes. The casting difficulty is what matters, because an increase in rune cost will have little to no effect when you never fail with the spell anyway, at least not when it's a small rune cost to start with (unlike for MV). Unless you're planning to increase the cost by a lot (and judging by how you seem to think chastity is rather crappy, you're not) it's not a solution. Start playing in warring kingdoms again and you won't enjoy how easy it is for them to keep you at 2 peasants per acre, something that shouldn't be easy at all, because it really does serious damage.