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JerryJeff, you will have the time of your life assembling a T205 set, which in my opinion, is the most beautiful set ever produced. I have completed one, including all of the variations and am about 8 short of a second complete set.
The toughest card is the Hobby no stats. I would add A.P. Leifield to those listed by the other posters. The toughest back is Drum with Hindu a close second.
Good luck and enjoy the adventure.