@Soundtrack:
hmm..
Spyke is an uncommon that's why I believe it would not be that expensive (except someone wants to destroy his price)
Karrion, I reckon it could be 10K IF people believe he deserve 10K
IMO, both did not really deserve being 6K or 10K card
Ghumbo before is 10K, I don't see any reason
Karrion could surpass him in term of price.
also
Karrion is not a perfect card (unlike
Ghumbo which is very versatile)
Karrion needs to play earlier which might not fit with some people's play style
P.S: I might be totally wrong though, so, sit back and let see how much do they cost in few months