For the Free to Play games Team Fortress 2 and Dota 2 you need to buy an in-game item in order to get cards to drop.
For your other question in the case duplicate cards that does still count as a card drop and it will not drop any more cards while you play that game. HOWEVER you can randomly get a booster pack for any game you have gotten all the drops for as long as you have logged into steam within a week. They are kind of rare though. Otherwise yes, you'll have to buy or trade for the rest of the set.
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As you already pointed you get HALF of each game set. DotA2 and Tf2 and Warframe required (to get card drops) to pay in-game money to earn more drops. And when a game says "you have 0 drops left" means you'll never get any cards again from the game BUT there's a thing called booster pack, which allows you to get 3 cards for a random game YOU OWN and that you have 0 cards left IN IT. Booster packs drop randomly after the community crafts enough badges.
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Though Steam has FAQ for the trading cards, I dont really get it. Maybe you could help me out:
I know:
you can get half the cards from the complete amount of cards available for a game ( 4 of 8 / 5 of 9 / 3 of 6)
you get them randomly while you play
you have to trade the cards you can't get your own while gaming
want to know:
I have DotA2, but steam tells me no card founds are left though I haven't got any. So I won't get any cards for playing it?
If I have all cards I can find for a game (4 founds, but one card twice), will I NEVER get anymore cards for this game and have to buy all? ( seems to me because of my card drops for Don't Starve or CS:GO etc.)
Thanks /sorry for my english / greetings from Germany,
Noxelius
@edit:
questions answered, thanks to you :) , community really is better than reading FAQ's and sh*#! :P
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