due to some good luck, i managed to get a few more cards. so here's an update:
Extras I have:
Steam Summer 2013 Sale
- Bioshock Infinite, Skyrim, Prison Architect (x2)
TF2
- Heavy
Half-Life 2
- Trouble Underground
Torchlight 2
- Vilderan
Portal 2
- Glados x2
KF
- Siren
Cards I need to complete a set:
Skullgirls
- Parasoul, Valentine, Double, Marie
Steam Summer 2013 Sale
- Riptide, Football Manager, Reus
L4D2
- Boomer, Witch, Smoker, Spitter
TF2
- Demo, Soldier, Scout, Spy
HL2
- Alyx, Gman, Gordon, Respite, Metrocop
Torchlight 2
- Dark Alchemist, Berserker, Outlander, Engineer
Portal 2
- Intro, Chell, Destruction, The Lab, Underground, Finale
KF
- Almost everything.
If interested, PM me for steam info.