This is one of the best cards in the game with out any argument. There should always be at least 2 of this in your side deck.
In you standard deck the best combo for this would be to destroy a cad on your opponents end phase, set your Return From The Different Dimension wiht Dust Tornados effect, and then chain to your draw phase for an amazing win.
Aside from the traditional decks that you will see using Dust Tornado you will see decks using this to kill off the treats of several cards. Some of the more popular ones are:
Return From The Different Dimension
Call Of The Haunted
Others can rang from any thing that may include field cards, burn card, stall cards, and etc.
The idea is simple. You use dust as your extra line of deffence against those certain cards that would have finished you off. If you are using this card then you already know that. If you aren't then try it.