What your going to need:
http://www.kickasstorrents.com/octgn-w-magic-the-gathering-2-8-t3429809.html
This torrent has 90% of all the current card sets. Once its downloaded you need to spend some time making sure all the files inside the set folders are in 1 folder. This makes it so much easier to patch. So go ahead and open all the folders up and drag out all the files into 1 folder.
Don't install OCTGN from this Torrent just extract all the sets into 1 folder.
Ok next you need to go here: for some reason this bugs out so go to www.mediafire .com/sets without the space between fire and .com
go to this folder "OCTGN 2 - Game Definitions & Other Files>1. Game Definition v1.0.x Close Sharing Tab" and download "Magic.v1.0.o8g" & "Markers.v1.0.[brine].o8s"
Again place these files into the folder where all the other card sets are.
Now go to this folder from:www.mediafire .com/sets OCTGN 2>Sets>Single Set Files>B.Patches v0.0.2.x to 1.0 and download "Mtg-Patch-2010-06-27.o8p"
Again place these files into the folder where all the other card sets are.
Once this is done go to OCTGN 2>Sets>Single Set Files>A. Set Files v1.0>Standard Legal Sets>Zendikar And download "Rise_of_the_Eldrazi.v1.0.[GO].o8s" & "Worldwake.v1.0.[GO].o8s"
Once you have downloaded worldwake and rize of the eldrazi files dump them into the folder with the rest of the card sets and where everything else is stored.
Now go here: http://www.octgn.net/downloads.php and press install OCTGN 2
Once its installed press "manage installed games" then press "install new game"
Browse to the folder where everything you have downloaded is stored and the only file you can click on to use is the magic one so install it.
Then press "patch sets", click the patch file box and again open the folder where everythign is stored the patch file is the only one you can use.
Now Drag this folder into the folder box and hit ok.
Once it has all been patch press "install new Cards" again browse to the folder with all your set files in, note you can highlight all the cards and import them at once. e.g. CTRL+A then just hit ok.
Note some cards wont import but you will have nearly all cards in current mtg circulation with the exception of M11 cards but they were only released last friday i imagine that M11 set will be released soon.
Once its all setup come on vent and look for people wanting to play atm were probably going to use "hamachi" to play virtual lan games but ill sort something out:).
Any question please ask or if you get lost please say and ill try to walk you through it as best i can.
Links used in this and summary:
http://www.kickasstorrents.com/octgn-w-magic-the-gathering-2-8-t3429809.html
(torrent containing 90% of cards)
www.mediafire .com/sets
(Website with the MTG game plugin Patch and Newest card sets)
http://www.octgn.net/downloads.php
(octgb client)