@Lawn---Man, I need more info about your project. You referenced Superku, is you project a 2d,2.5d, 3d side scroller like Superku?

If so here are a few ideas.
Use a 2d animated sprite, attach the base to your swamp. Basically build a 2d image that graduates to full fade (32 tga alpha), apply a solid noise to it. Then use it to produce a animated sprite.

2) Use a single tga with noise, then use a shader to animate it and fade it's (possibly with a second alpha image)

3) use a 3d cube, assign a white noise texture to it, set all sides but the front facings with a full alpha texture, Use the mtl_turbulent for the standard lib to move the surface texture of the cube in a smoke like manner. Or the mtl_uvspeed possibly.