yes but it would be pointless
Yes. You should be able to buy spare land from your local card store, or online.
Yes they are. Regardless of the colour of mana they produce, a land is still a colourless permanent unless an external source is giving it a colour.
Landwalk is a term that appears within a cards rules text as "[type]walk," where [type] is usually a land type (Plains, Island, Swamp, Mountain, Forest or Non-basic) but can be the card type land, any land type, or any combination. Landwalk is an evasion ability. Meaning a creature with landwalk is unblockable as long as the defending player controls at least one land with the specified type.
The Coldsnap land 'Dark Depths' produces a Marit Lage token.
Awakening, Bear Umbra, Early Harvest, Nature's Will, Reset are the ones that i can think of at the moment. :)
A swamp is a landform
That heavy load will swamp the boat! Poke Salad Annie lived in the swamp.
Island-walk A Land-Walk ability(Example:Swamp-walk, Mountain-walk) If opponent controls an island this creature is unblockable. Creatures with land-walk abilities can not block each other.
Some of the land in the city of Houston is swampland, but it is not entirely swamp.
a swamp is a combo of land and water.
fisha swamp!
The duration of The Magic Land of Allakazam is 1800.0 seconds.