Imaro
Legend
They're randomized within the packs, so that the benefit of each pack is = to the benefit of each other pack.
For instance there's no chance that say a card in this pack will give you a +5 bonus, but the highest bonus from a card in the next pack will give you only +2. Both will give you a card with the +5 bonus possibility.
The cards might have different flavor- but thats the equivalent of the dice colors.
You don't need to continuously buy packs on a quest to hunt down the elusive +5 bonus card.
This doesn't make sense... as seen in CCG's and collectible mini games... even cards and minis with the same rarity can have different levels of power in the game... so no your assumption that rarity level does, on a one for one basis, equate to power level is not correct.