Gravelstorm is a common Trap Card from Generation Force, what it does it:
Target 1 Spell/Trap card on each side of the field; return them to the hand.
So this card techincally has multiple applications first of all you can use it as a out to your opponents backrows like a CED for spell or traps, as well you can combine this card with once per turn cards like Dragon Ravine and Gates of the Underworld. By bouncing your opponents threats and then reusing your effects.
You can also use it to abuse cards like Skill Drain, during your opponents turn you have Skill Drain active and then during your opponents End Phase bounce Drain and your opponents potentially harmful Face Down Trap.
This card potentially has lots of uses and it may begin to see play if people figure it out and find more amazing combos for it.
In the comments tell me other great ways you can abuse this card,