pacman
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Well, I don't know. Personally, I only buy zombies when I have extra money, and I leave them in the city. And I don't really use skeletons much (because I don't know how to use them effectively).
In my opinion, if you buy upgraded vampires on the first day and a Castle, and you have enough money (although I think it's impossible to do on day 200...), then on the second day you can buy Cannons and Hives and use only vampires. And then, with Angels, Wyverns, Vampires, and Liches, you can attack the opponent and gather skeletons along the way. I think the opponent won't have time to build Angels (let alone Archangels) on the second day. So, I don't agree that the Castle will win if you play quickly... and I repeat, they are equally matched.
In my opinion, if you buy upgraded vampires on the first day and a Castle, and you have enough money (although I think it's impossible to do on day 200...), then on the second day you can buy Cannons and Hives and use only vampires. And then, with Angels, Wyverns, Vampires, and Liches, you can attack the opponent and gather skeletons along the way. I think the opponent won't have time to build Angels (let alone Archangels) on the second day. So, I don't agree that the Castle will win if you play quickly... and I repeat, they are equally matched.