Lets go category by category
Note that's any land, not just basics
(Note: The card images displayed may not represent the versions found in Mystery Booster 2 .) White Back to top Blue Back to top Black Back to top Red Back to top Green Back to top Multicolor Back to top Colorless Back to top Land Back to top For other reprinted cards (such as white-bordered cards and Future Sight frame cards), as well as Alchemy, playtest, and new-to-tabletop Magic cards, check out the Mystery Booster 2 Card Image Gallery
That said, both Swords to Plowshares and Dispatch are more than playable, and I think which you pick first will depend largely on what your deck is trying to do
Why is the GP weekend important
Returning a tapped creature is part of the cost, so if you don't control one, you can't use web-slinging to cast the spell