A searchable land that provides two of the deck’s primary colors without any drawbacks.
Unlike Underground Sea, Volcanic Island has no complimentary land since Bayou has left the deck. While this does diminish the value of Volcanic Island slightly, there are aspects that still make Volcanic Island pretty great. With Pulverize AND Crash in the sideboard, TES needs more than a couple of Mountains in the deck. Volcanic Island is currently one of three Mountains for this purpose.
A trick for playing with red “dual lands” is to sit back on “fetchlands” and make sure they don’t get hit by Wasteland if in a position where casting Crash or Pulverize is necessary.