[8] The five basic lands are as follows: White lands, or Plains, which produce white mana Blue lands, or Islands, which produce blue mana Black lands, or Swamps, which produce black mana Red lands, or Mountains, which produce red mana Green lands, or Forests, which produce green mana There are also different kinds of lands (dual-lands and tri-lands, for example), but the most a beginner needs to know is that basic lands produce mana of one color only, and that multicolor lands can produce mana of two or more colors
With Mono-White Humans and its variants running amok in Standard, you have to be able to block, hopefully with some incremental value along the way
Getting these powerful cast triggers of the Eldrazi really cheaply is just nasty to think about
But I like that Claim Jumper potentially triggers twice