Key in DOTA 2 for games in steam

[Blady]

Hello. I want to sell 6 DotA games for a games on steam. I am selling 3 keys for a 1 game. The games i am interested is:
-Left 4 Dead 2
-Dead Island
-Terraria
-Magicka Vietnam
-Bit Trip Runner
-Dungeon Defenders
-Counter Strike : Global Offensive
-Serious Sam 3: BFE
-The Elder Scrolls V:Skyrim