Magic The Gathering - Duels Of The Plainswalkers Cheats (PC)

The Black Vice in most verisions is broken; it applys DOUBLE damage whenever you use it.
  Get a Black Vice or two, and you're bound to destroy the bad guys. Add in a couple of
Lightning bolt to finish them off, or cards like Wheel of Fortune or Timetwister to bring
your opponent back to 7 cards before hitting them for double vice damage.

There is a way to hack into the programming of Magic the Gathering and its expansions.
  To do this you must open up a DOS box from windows or begin a DOS session. Then you
must switch to whatever directory magic is in (e.g. C:Magic)
  Then type "cd programdeck". Type dir and you will see a list of .dck files that are
numbered. If you type edit 0010.dck you will be brought to a screen where the cards in
deck 0010 are listed.
  The screen should say the creatures name at the top as well as its color. Listed in
columns should be the cards' serial numbers, the amount of each card and the actual name
of the card.
  To take out the land simply replace the quantity of land with the number 0. Make sure
before saving that the total amount of cards in the deck is still at a minimum of 40
cards.
  You may change the land in any numbered deck in the same way.