i cant remember how did i beat this ai. i remember i use stock black deck "eye of shadow" - easiest.
stock blue "mind of void" - alternative, a bit risky.

start with this 7/8 cards on hand or restart the match

at least 1 terror card/deathmark(1 mana)<- recommended but stock deck only have 1 card
destroy large creature which threaten u, like wurm 5/4, 6/4

1 rat card, or skeleton
-use them to block incoming creature attacks, skeleton can be regenerate so u can use them to block larger creatures. rat discard 2 opponents card, very useful to discard opponent larger creature cards- use them after opponent left with 3-4 card on hand.

1 corrupt - deal 1 dmg to opponent for every card he /she draw.
-use this to bleed the oppenent dead expecailly green players, and use ur skeleton to block your his/her attack.

the rest are land (3 recommended) or creature / spells

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Added on October 6, 2010, 11:43 amred deck have 2 land destroying cards "earthquake" (locked - expansion 1)

in this game, i feel black is the most annoying and most powerful deck. but in 4 plyrs FFA, black players are going to get killed first.

red are good in 1 on 1 and u must finish off the oppenent after 5 -6 land cards.

white and green are stalemate decks

blue decks are turtle deck, and hopefully they have enought mana to counterspell

This post has been edited by y3ivan: Oct 6 2010, 11:53 AM

oh by the way, i played this game on xbl winter arcade 2009 bundle. so i cant really remember whats the full stategy. if i m not mistaken i have unlock 90% of the cards, took me 1 month nonstop.
man this game is addictive

try playing the tree huggers deck, u can easily cause 40++ dmg in round 12. to bad i didnt keep any record.

yes silly. to be precise "ears of the elves". u can produce ridicules amount of elves and u just wait for the opportunity to cast overrun.

if u traumatize the black deck. u will be the one getting pwn.

1.blue player -> traumatize
2.black player -> cast Mortivore
3. Creature with ??/??
4. ???
5. blue player dies.