Kisame or Suigetsu uses Water Release: Water Dragon Bullet Technique with Gaara mixing his sand with it and the dragon shoots mud at the opponent.
Trivia
The Earth Dragon part of this technique would usually be pronounced as mogura and is actually the Japanese word for mole. However, given the nature of this technique and similar techniques from other elemental lines, the pronunciation and meaning are likely meant to be Earth Dragon and Doryū.