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I removed the "Urban Sentry Transposition" section because the claim that Urban Sentry is similar defensive efficiency to Wall is false. It's significantly worse. Wall is 5B for 3 prompt HP; Sentry (used this way) is 5B for 3 1-turn-delayed HP and a Gauss Charge. My graph here shows it. For reference, under normal circumstances a Gauss Charge is worth something like 1.9 gold, and having your HP delayed by 1 turn is a loss of about 0.6 gold. That's also not quite what a "transposition" is, unless I'm mistaken. Yujiri (talk) 03:38, 6 February 2019 (UTC)Yujiri
It's a transposition when soaking an already existing Sentry, replacing it vs saving it with Wall. 188.8.131.52 02:30, 12 February 2019 (UTC)User SSP
Except that the Sentry costs a green. You have a Sentry. If you buy a Wall, you spend 5B and your Sentry survives, dealing another point of damage. If you buy a Sentry, you spend 5GB, the old Sentry dies, the new one comes in to replace it and deals a point of damage on its way in, so its exactly the same except that the Sentry is more expensive. Yujiri (talk) 08:56, 12 February 2019 (UTC)Yujiri