引用自 K3v1nM4X：

I have already sold Skullgirls cards to form a badge and now I do not have any, I do not know if it has anything to do

https://psteamcommunity.yuanyoumao.com/tradingcards/faq

What about free to play games like Team Fortress 2 or Dota 2?

Free to play games drop game cards based on your in-game purchasing. For every $9 USD spent (approximate) since the start of the Steam Trading Card Beta, you will earn one card drop. This card will drop at some point as you play. If you have made in-game purchases in Dota 2 or Team Fortress 2 prior to the Steam Trading Card Beta, or if you owned Team Fortress 2 prior to the Free to Play update, you will have 4 or 5 additional card drops available.

https://psteamcommunity.yuanyoumao.com/tradingcards/faq/

Buy more games.

引用自 KurroKapp：

IDLING Killing Floor 2 will get me VAC BANNED ?

Nope.

https://psteamcommunity.yuanyoumao.com/tradingcards/faq

ASF

http://m.memegen.com/u99e7l.jpg

引用自 high ping TANK!Farmskins.com：

if saying "no card drops remaining" in steam badge page. still this app can make drops?

Nope, buy more games.

https://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/1290691937722380084/

https://psteamcommunity.yuanyoumao.com/tradingcards/faq/

Yes you can. Don't play on VAC secured servers while using IM - that's all.