This has been discussed many times.

Fetchlands are perfectly acceptable with Brainstorm or Engineered Explosives. These cards are usually only played in draw/go versions of MUC. Versions which use more permanents often don't play play either of the mentioned cards, and thus have little reason to play fetchlands.

Deck thinning isn't as meaningful as some people thought, but it still does something, especially in decks that tend to draw half their library each game. The lifeloss for the thinning effect alone isn't worth it though.

Some people don't like Brainstorm /shrug, tough. Fetchlands and Brainstorm have proven themselves in tournament quality MUC decks many times.

@ Zir

I agree that shuffling is generally not wanted after an impulse. But, I think it is important to remember there are also times when you're forced to choose between good cards that you don't want on the bottom of your library. Sometimes I really do want to shuffle after Impulse, sometimes it just doesn't matter, and sometimes I am glad that junk is on the bottom.





peace,
4eak