The "lore" aspect is two Planeswalkers and their armies duking it out, here are the rules:
Cards sets allowed: ALL (limitations apply)
-Cards from all published sets are legal for play in the Duels of the Planeswalkers format. However, some limitations apply to certain cards.
-Four copies of any Magic: the Gathering legal card are allowed in a DotP deck (like a normal deck)
-The offical Vintage banned/restricted list from Wizards of the Coast is applied to this format
-Decks for the Duels of the Planeswalkers format consist of a minimum 61 cards and no more. These 61 cards consist of:
-A 60 card library, whose cards’ numbers yield to the limitation printed above
-One Planeswalker card set aside to serve as your deck’s Planeswalker, it can be from any set
-A 60 card deck for the DotP format may contain: lands, creatures, and other spells besides Planeswalker cards. Your deck is NOT allowed to contain any Planeswalker cards besides your deck’s Planeswalker (which is set aside from your main 60 card deck). You also may NOT have additional copies of your deck’s Planeswalker within your 60 card library.
-Your deck may only have cards in it that share a color with your Planeswalker or is colorless, and cards that would produce a color of mana that is not shared by your Planeswalker produces colorless mana instead (like in the Commander or Elder Dragon Highlander format). For example…
-A deck whose Planeswalker is Garruk Wildspeaker may only contain cards that are green or colorless, and cards that produce any color of mana besides green produce colorless mana instead.
-A deck whose Planeswalker is Venser, the Sojourner may only contain cards that are white, blue, or colorless, and cards that produce any color of mana besides white or blue produce colorless mana instead.
-A deck whose Planeswalker is Karn Liberated may only contain cards that are colorless, and cards that produce any color or mana, produce colorless mana instead.
-When playing the Duels of the Planeswalkers format, each player starts the game like a normal game of Magic, except for a few tings... Both players begin the game with thirty (30) life, with their Planeswalkers set aside to a Commander/General/Planeswalker zone. Planeswalkers' casting costs must be paid during the game to use them, they are then removed from the Planeswalker zone and put in play, and used like they would in a normal zone. If a Planeswaleris removed from the field, it goes into the Commander/General/Planeswalker zone and they may be recast from this zone for their casting cost plus an addition two colorless mana (just like generals/commanders in the EDH/Commander format).
NOTE: If each player is using the same Planeswalker, then the rule pertaining to Legendary creatures/Planeswalkers where two Planeswalkers of the same type existing on the field at the same time must both be sent to the graveyard does not apply.
-When playing the Duels of the Planeswalkers format, if your opponent’s Planeswalker has been cast, then your creatures cannot attack your opponent. Your creatures must instead attack your opponent’s Planeswalker. Whenever a Planeswalker is removed from the field and put into it's zone, its controller loses 2 life. When a player runs out of life or their Planeswalker has been removed after being recast 5 times(a.k.a. after 5 addition casts beyond the first), that player loses. Choose when to cast your Planeswalker wisely...
PLEASE MAKE SUGGESTIONS/COMMENTS!!