I believe Miller was the last card I found when completing my T207 set, it was very, very tough (although not as tough as Donlin).
Saier has the reputation of being nearly as tough but I have bought 4 Saiers in the last few years as I continually upgrade my cards in the set and then sell the ones I have upgraded. I didn't find it to be that tough.
The ones that I found toughest were Block and Donlin.
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