Did Pindicator do something else too? He might have declared war to get your scouts out because he thought you were looking for an opportunity to snipe from him (he can see your ships heading to Stages A and B).
I'm not sure you'll be able to get at those three under-defended cities - he might counterattack the injured units at Lorwyn with the contents of Ravnica and destroy them. That's not really an argument against enacting the plan, because that's still a remarkably cheap cost for razing those cities. Even if not, he'll be able to bring down the units in Tarkir, Prairie Village, and Avendale to help hold his back lines here. So I'd still do it, just with the recognition that there are not likely to be more results from it than those achieved on the first turn.
Edit: And hopefully it will spur Krovice into action too. After this, I'd focus on building naval supremacy so we aren't threatened and dtay has to invest in defence, and so we can take advantage of any further opportunities that may present themselves (but I believe this is already the plan).
I'm not sure you'll be able to get at those three under-defended cities - he might counterattack the injured units at Lorwyn with the contents of Ravnica and destroy them. That's not really an argument against enacting the plan, because that's still a remarkably cheap cost for razing those cities. Even if not, he'll be able to bring down the units in Tarkir, Prairie Village, and Avendale to help hold his back lines here. So I'd still do it, just with the recognition that there are not likely to be more results from it than those achieved on the first turn.
Edit: And hopefully it will spur Krovice into action too. After this, I'd focus on building naval supremacy so we aren't threatened and dtay has to invest in defence, and so we can take advantage of any further opportunities that may present themselves (but I believe this is already the plan).