I'dd say the upgraded version is a bit expensive on
actually the ammount of required is quit resonable comppaired to the effect of the card
True, and remember that
can summon Micro Abominations and Lycanthropes/Werewolves for a quite low cost... So this is like a lot of Chaos Seed/Chaos Power. Anyways, it may be too slow, and the targetting system... IDK if it can be implemented, nor I understand how you mean it to work. I guess you mean it's as you have just clicked the Chaos Seed/Chaos Power card, so you have the "cancel" button there, but you should explain it better.
PS: it needs something to do when it stacks, maybe even make it stackable, since it's not cheap at all...