Ok not great speed but great special atk and high defensise with boosting moves.
Speed isnt needed.
It hits extremely hard with life orb because thanks to magic guard it says goodbye to sandstorm and life orb damage.
Great synergy with sand teams, great spatk, great speed and can rapid spin.
theres not much more of an explanation needed.
This guy is also great in sand with high special atk and decent speed.
It has a typing which absorbs attacks that sand teams have problems with.
Ice beam and its set in general provide good coverage.
Great special sweeper and preforms well in sand.
Spin blocker stopping rapid spinners blowing away hazards that sand teams always have.
Appart from that it has great speed and preforms just like starmie.
If you want sets ask.