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Kostya, what is this nitpicking? The rules don't say that you have to sit and skip turns to buy creatures! You have 5 Air Elementals and 8 Water Elementals left, which is clearly less than half of the starting army!
And if there were 90 Archers, would you say to wait for the Fire Elementals to be bought? And so on.
Regarding the blockade, I agree with Hell, if there was someone more serious, then you could count on a tech rush, but Archers are still quite manageable guards, especially without a Guardian Spirit.