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If Deus Ex includes The Missing Link DLC, I could give you a Castle Crashers. If not, any less than 3€ game from the Big Picture Release sales.
Europa Universalis 3: Chronicles + Hitman Sniper Challenge and COH 2 beta key for FOTS? :)
Gifts
Counter-Strike 1 Anthology
Magicka Collection
Keys:
Warhammer 40.000 Gold
King's Bounty: Warriors of the North
Magicka: Vietnam
Humble Voxatron Debut
For Witcher 2
A long shot, but any combination of the below for "Orc Must Die 2 Complete (gift)" and/or "Cities Xl Platinum (gift)"?
Have:
Zeno Clash (gift)
Orc Must Die 2 Complete (gift)
Nexuiz (gift)
Garry's Mod (gift)
Cities Xl Platinum (gift)