Even though it makes sense that a Geist is difficult to get rid of, I would give 0|4 and 0|5 at the most so that it can be CCed in a fair way.
With 0|6 it doesn't just survive a Thunderbolt but even dodges an upped Oty by 2def, and that's just unupped. The upped one can even survive a double Fire Bolt, which, compared to almost all the other creatures, is really really strong...
About the idea of the card: Besides the fact that, as a native German speaker, I like the use of *Geist*, I even more like the mechanic of the card. The art is nicely done as well 
Considering their abilities in as well, I think the upped one is less of a threat since its less global in nature. Note that having creatures that can't be one-shotted by lightnening, even unupped, isn't that uncommon.
Steam machines, for instance, are very hard to kill. They aren't much more expensive either.
Whether or not this fits
element is a different story though.
Death seems to favor moderate to high damage but only low to moderate hitpoints. Thus far, nothing in the
element breaks 5 hp when cast (vulture can exceed this, but starts quite small). Even the dragon (typically the toughest creature in an element) only has five hp.
One way to get around this would be to give it lower hp (maybe 4 and 6) and a passive damage resistance... e.g. something like:
"Ethereal: May resist damage" or "Ghost: Dampens spell damage" etc. (you could define the scheme in the notes)
At any rate, considering the lack of attack and relatively defensive abilities, the high HP is probably not a big deal balance wise.
This may be useful in looking at HP vs. cost balance
Cost theory, focus on HP - Threadunupped:
attack = 0 -> 0
hp = 6 -> 3
skill = ? (I would say most would agree on something between 0 and 2... lets say 1 for now to get going)
Element bonuse (none for
)
So: 0+3 +1= 4 ...
upped:
attack = 0 ->0
hp = 7 -> 3
skill = ? (lets say 1 again for now)
Elemental bonus = 0
Upped bonus = -2
So: 0 + 3 + 1 -2 = 2
So the unupped is probably a little too strong, whereas the upped version is slightly too weak.
My suggestion is to drop the unupped version hp to 4 and bump the upped version to 8 hp (assuming the cost is to remain at 3
)
As a parting note, the above analysis is contingent upon the weight given to the abilities. I'm not sure where to begin on that, so its a good point for discussion.
Hope this helps move the discussion / card development forward.
