It is important to keep in mind that I made this deck online, so I just used the best cards I happened to own. This deck does not need Shocklands, though if you replace them I would think Pain Lands would be a cheap alternative, or even basics. I would not replace them with CITPT lands, though, as it gives more time to disrupt combo pieces. You also may not be playing using sideboards- if so just ignore it.

Muddle is especially nice as it grabs any one of seventeen cards, thirteen of which are combo pieces.

Dispel instead of spell snare??