I haven't got much experience using a Gheist deck. But in this case Ludmilla would be good to keep going for some more time until you get Rolph or Xu52. Ok.. so Vladimir hits with a sold 7 damage but if you are able to get the poison of ludmilla through in the first round, with the damage and the poison in all the rounds, it comes to 10 damage in all. Get Tyd cause SOA kills Wheeler.
Tyd is seriously a much better card for newbies.. keeps your deck level low and he has some great offense PLUS he has SOB.
true vlad has a good ability bonus and damage but his 6 power can really get its butt kicked.. when I first started he was my "best" card.. which I lost... ALOT....
get some more experience learn the basics and stick with high power cards and worry about damage a little later.