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It could be @cicisaja. The thinking on having it be a single use card, whether valid to play for 24 hours or no time limit (which no time limit would likely be easiest are more simple) is that it would counteract the single card that is pictured, so on the example above, let's say the skeleton assassin DARK KARMA card is played in the same match that your opponent played a skeleton assassin then the card would either be stunned or poisoned, depending on the ability on the DARK KARMA card. If the opponent does not play a skeleton assassin and you use this card then it is used up and it doesn't affect the battle and is burned forever, or is only valid for the remaining time period if there is a timer on the card. There could be a DARK KARMA ZONE Card, where you would get a joker type of card for a position in the opponent's lineup for that given battle, and then the ability on the card could take hold. That would actually be a lot more simple too. The production of the furthest back would likely be the highest, then halved by the next spot, then the next spot, so that everyone wouldn't just drop this zone card on the other person's tank, at least without spending a very valuable card, especially when you are doubling (or an even higher factor perhaps) the rarity each space you move forward in the lineup from back to front.

But.. How about the distribution? Im afraid that only those who can purchased hundreds pack would get it.. and it will be a contra-productive if that kind of Karma used in a tourney.. becausr you know, that kind of cards will really usefull in tourney rather than the ranked

Good point. I actually recommended having these cards being cross distributed in booster packs, single player rewards, guild rewards, or in mystery reward potions--across the board in all ways how cards are distributed.

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