Zwillinger (community rep) posted the breakdown of items within each card rarity. As I'm posting this, I hadn't seen the breakdowns for each rarity itself, although he also mentioned a guaranteed uncommon/rare in each pack.
Here's the link to the breakdown: http://boards.cityofheroes.com/showthread.php?t=284104
One number that caught my eye: the chance for Black Wolf pet - a 0.3% chance per Very Rare card you get. As I said, I don't know the frequency of Very Rare cards, but even if you got one in every pack you bought, I could see someone easily going through 300 packs without getting one. My moral: don't try to get one, just be happy if it drops for you. If you absolutely must have a wolf, well, see if you can hold out for Beast Mastery.
On the plus side, each card rarity group has 2 or 3 Elemental Order pieces in it, and each piece has from 10% to 14% chance to drop. Also, the ATOs in Very Rare are above 33%, so a Very Rare card is better than 50% chance to have either a costume piece or ATO.
Also regarding ATOs, they will be (or maybe already are?) purchasable with 400-500 Reward merits plus 25 Mil Inf, or with 50-70 Astral Merits.
Here's the link to the breakdown: http://boards.cityofheroes.com/showthread.php?t=284104
One number that caught my eye: the chance for Black Wolf pet - a 0.3% chance per Very Rare card you get. As I said, I don't know the frequency of Very Rare cards, but even if you got one in every pack you bought, I could see someone easily going through 300 packs without getting one. My moral: don't try to get one, just be happy if it drops for you. If you absolutely must have a wolf, well, see if you can hold out for Beast Mastery.
On the plus side, each card rarity group has 2 or 3 Elemental Order pieces in it, and each piece has from 10% to 14% chance to drop. Also, the ATOs in Very Rare are above 33%, so a Very Rare card is better than 50% chance to have either a costume piece or ATO.
Also regarding ATOs, they will be (or maybe already are?) purchasable with 400-500 Reward merits plus 25 Mil Inf, or with 50-70 Astral Merits.