The main problem with Survivor is that he's easily prevented. For all the good he can do (and I definitely think he's the second best pale green character, and probably in the top ten best evil characters period), he simply has nothing on the ability to CBN discard any fortress, artifact, or mono-colored site. Survivor can be splashed into more decks for sure, but Assyrians aren't even a B tier defense without ASA at the helm. In T2, ASA is really ridiculous, because with 2KH on him, Forgotten History x4 is just a bit broken. Thus, ASA gets my vote. Heck, even if Survivor is a little better in T1 (which I don't think he is), ASA's dominance of T2 is it for me.