OK, when I get home, I will edit the cards and add a poll.
The things I will change:
Necronomicon:
Since noone mentioned it in the posts, I think it can stay as it is until the Death Note balancing is completed but it will be the unupped card from now on.
Death Note:
* The card will be the upgraded version
* No instant kill but infect a creature with 5 poison stacks
* Still costs 50% of the maximum life but I thought about change 50% to 40 HP