CURATOR COMMENT-Not only were both images not available to use Kaos, but at least one of those images was considered NSFW; please DO NOT post those images or links again, or you may face more severe consequences. I personally removed them myself to avoid any other conflicts and complaints from some members of the community.
That said, keep the COST simple - trying to add variable equations can make it overly complex. The mechanic itself is fine, but it might seem a bit too risky for most players to use the upgraded version, as expensive creatures (nymphs, dragons, other high hitters, etc.) will often hurt the player more than the other (a player getting hit for the cost of the creature while the other player has it poisoned...?).
Also, WELCOME to the Card Ideas and Art Board. Please P.M. me with any questions you have regarding Card making and or the CIA board in general, and I'll do my best to assist you, okay?