[H] Contagion, Magicka, Nuclear Dawn, WH40k: Last Standalone [W] Payday 2, TF2 Keys

Wanna trade the games below for Payday 2. Thanks

Contagion http://store.steampowered.com/app/238430/

Eugene, Marcus, and other Survivors return in the spiritual successor of the popular Half-Life 2 Modification Zombie Panic: Source!
Contagion is a cooperative survival horror FPS built on the latest Source Engine where players are forced to watch their ammo and aim carefully otherwise be overrun by the zombie hordes. Players will face traditional zombies as well as former teammates who have been turned themselves and where friend becomes foe fueling the carnage to come.

Magicka http://store.steampowered.com/app/42910/

Magicka is a satirical action-adventure game set in a rich fantasy world based on Norse mythology. The player assumes the role of a wizard from a sacred order tasked with stopping an evil sorcerer who has thrown the world into turmoil, his foul creations besieging the forces of good.

Nuclear Dawn http://store.steampowered.com/app/17710/

Nuclear Dawn is the first game to offer a full FPS and RTS experience, within a single gameplay model, without crippling or diluting either side of the game.
As a soldier, explore war-torn post-apocalyptic landscapes, modelled on modern cities, and take the fight to your enemies as armoured, assault or stealth infantry, using various weapons across ten distinct load-outs to accomplish your objectives. The first person shooter action in Nuclear Dawn is hard, fast and unforgiving, with weapons that rely on skill and tactics more than on twitch reflexes and map memorization.
Then, take Nuclear Dawn above the action, and play as the commander. Organize your fellow players in squads, and assign them to tactical objectives. Plan the resource routes for your army, and production of your structures for forward deployment. Exploit the terrain and resource point locations to block your enemies’ advance, and crush their plans in an iron fist. Research and implement new technologies to give your soldiers the edge on the battlefield, and set up forward bases to lead the assault on your enemies, with a full complement of defensive and offensive structures to choose from, to build your perfect fortress.

Warhammer 40k: Dawn of War II: Retribution – The Last Standalone http://store.steampowered.com/app/56438/

The popular survival game mode from Dawn of War II, The Last Stand, is now available as a stand-alone game! Dawn of War II: Retribution – The Last Standalone is a cooperative survival mode where you control a single hero and face off against waves of enemies with up to two other teammates