Does your Badges page report it as having cards? The store page does not indicate it has cards.

Yes, it's here:

psteamcommunity.yuanyoumao.com/my/gamecards/316030

3 drops remaining, currently idling on IM (for 7 hours now)

i think is bugging mine not droping either

I have 2 accounts... on my first one everything is normal. It is dropping after 0.5 hour idle, but on my other account (which I never refunded and it is not restricted) is taking more than 2 hours to drop the first card.

No drops here

"similar" here takes about twice the time it did before (ignoring the +2hours) -
i don't keep track on steams time only the time that passes on the RL clock ...

this user had good and plausible theory for it, that might be the cause:

"Steam doesn't track ingame time correctly anymore (few weeks now) and that affects card drops. Ingame time only increases on 0.5 hrs intervals instead of 0.1 hrs."

http://www.steamgifts.com/discussion/syQ1l/whats-wrong-with-farming-cards-currently-takes-too-darn-long#hR1iBGZ

http://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/490125737469153259/

^ else i'd have no idea or would simply assume its the games or the drop rate changed

It once happened to me, took me 10.5 hours to get 3 cards of How to Survive