I think that I've found around 10. It really helps being level 10, 20, etc. You guys should hit for those marks if you want the sweet booster packs. Getting level 20 with the cheapest badges isn't difficult, especially with sales happening, since everyone just pawns off everything at the cheap to get whatever cash they can scrounge up. It's worth it in the long run. Not to mention the great profile showcases! You could be putting that Dick Ascii art to use.
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11 so far:
Anodyne (sold)
Super Meat Boy (opened, no foils)
Ion Assault (sold)
Portal 2 (opened, no foils)
Frozen Synapse (opened, no foils)
Saints Row: The Third (sold)
Awesomenauts (sold)
Hitman: Absolution (sold)
Hack, Slash, Loot (sold)
Offspring Fling (sold)
McPixel (selling as now)
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So what is special about the foil cards? Do you get something special if you craft a full set?
EDIT
Never mind. I found my answer.
"What are Foil Trading Cards?
There is a small chance whenever you get a Trading Card from playing a game that it will have a special foil border. You'll need to collect a set of foil cards in order to craft them into a foil badge. There is no extra benefit to having foil cards or foil badges aside from their rarity."
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7 of them.
And no, foil cards are only used for another badge that does nothing special.
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1 from Portal 2
4 from Team Fortress 2
2 from Saints Row The Third
2 from Half Life 2
1 from GMod
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Alan Wake (sold)
Zombie Driver HD (sold)
Afterfall Insanity (opened, no foils)
Trine 2 (opened, no foils)
Superfrog HD (opened, no foils)
Day of Defeat: Source (opened, no foils)
Super Meat Boy (opened, no foils)
Party of Sin (opened, no foils)
Garry's Mod (opened, no foils)
Beat Hazard (opened, no foils)
Half Life 2 (opened, no foils)
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6 or 7 booster packs. I can't remember what games though. Most recent was a Guns of Icarus online pack.
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CSGO
Batman Arkham Origins
Dungeon Hearts
Outlast
Half Life 2
Deadlight
Super MeatBoy
Mark Of The Ninja
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So far i've found 8. ( + made 9 with one foil. )
How can I get a booster pack?
Once you have received all of your card drops, you become eligible for a booster pack, which is a set of 3 trading cards that may include both basic and foil cards. Booster packs are granted randomly to eligible users as more badges are crafted by members of the community. Make sure you log in to Steam each week to maintain eligibility.
Once eligible, your Steam Level increases your rate of receiving a booster pack drop: Level 10: +20% increase in your drop rate Level 20: +40% increase in your drop rate Level 30: +60% increase in your drop rate Level 40: +80% increase in your drop rate Level 50: +100% increase in your drop rate (i.e. the rate has doubled) Etc.
Info grabbed from IronMaiden666 - here
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