A card reprinted in multiple sets, or with new art, new card frames, new flavor text all of these are examples of a gameplay design, game balance, or artistic design decision
I'd also suggest considering Skeletal Scrying over Necrologia
Oh, and she gains life too, so I guess you can go for a Lifegain subtheme, but the real focus is that sweet sweet card draw
Phasing is a long-time mechanic that has gone through a lot of iterations over the years
Then your foes may also choose targets you don't control as well and destroy them
Doctors and companions work together using the Doctors Companion mechanic, which is a variant of Partner, allowing both the Doctor and their companion to operate as commanders from the command zone