Gah...
I sent this same idea to Zblader a couple days ago...
As I dont really have time to make cards, one sec let me look through my messages.
Found:
Z, I know your the guy to talk to when designing cards *Yes I want you to use an idea Ive had recently*, I ask you as I netheir have the time or the experience to get it too work correctly.
Unuped Name: Soul Catcher
Element: 
Cost: 5 
Weapon
Deal 4 damage at end of turn + X, X= Number of creatures On opponent's side of the field that have died, since this card has been in play, divided by 2. *Needs text to be shortened*
Uped Name: Soul Crusher
Element: 
Cost: 5 
Weapon
Deal 4 damage at end of turn + X, X= Number of creatures, that have died, since this card has been in play, divided by 2. *Needs the text to be cut down*
Stats while flying for both unuped and uped= 4+X and 5 Health
Also was working on some art for it, but I guess you can use it, still needs work though.

Some other Art I was making for a different card idea that I had recently, probably will help you more than me anyways

Asked vrt for help a couple days ago also and got some feedback, anyways, no matter, like Mr.Bell and Mr. Gray over the patent on the telephone, its your project now.