How to start modding and unlock decks

This is for Duels of the Planeswalkers from 2010. For information on modding 2014, go here.

The below information taken from somethingawful forums

Necessary steps to start modding the game

Extract Data_Core.wad and Data_DLC_0004.wad by dragging them onto Gibbed.Duels.Unpack.exe
Data_DLC_0001-3 only contain backgrounds, avatars and such so you don't need to worry about those unless you want to mess with the interface graphics.
You now have Data_Core_unpacked and Data_DLC_0004_unpacked, each containing a folder of the same name but without the _unpacked part. Move the folders named Data_Core and Data_DLC_0004 into the main Magic folder. There's 50000 files in Data_Core.wad so it may take a while.
To get Magic to read the files you just extracted instead of the original wads, you need to rename originals. I add a _ at the beginning, renaming Data_Core.wad to _Data_Core.wad and Data_DLC_0004.wad to _Data_DLC_0004.wad You can also just move them elsewhere. Be aware that if the game patches it will recreate these files.
Do not make a new .wad with the Packer afterwards, that's mainly for if you want to distribute a pack of new cards decks or something like that. If there is a .wad file the game will not load the directory of the same name.

Open data_core\data_all_platforms\data_required\frontend\common\ui_scripts\core.lua in Notepad
Search for "SECRETBUTTON". Change the first occurrence to:

   SECRETBUTTON:setVisible(1);

Download http://dl.dropbox.com/u/7636448/deckmanager.xml and put it in data_core\data_all_platforms\data_required\frontend.
Unlock Deck can be used to unlock decks you don't have yet or to unlock all cards in a deck you have. You need to leave the edit/preview deck screen before the change take effect