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How about 3 TF2 Keys plus Frozen Synapse (and any of my cards or game keys you care for) for Starbound?
Omerta: City of Gangsters + Painkiller: Recurring Evil + Shattered Horizon + Men of War: Vietnam + Mount & Blade + Iron Grip: Warlord + Dogfight 1942 for Starbound + Castle Crashers?
Not interested in in-game items, thank you :P