Wind
Wind Dice attacks the frontmost mob. It has the fastest base attack speed in the entire game. As you proceed to level up the dice during game-play its attack speed will increase.
The speed increase from wind can be calculated as follow: (100% + (10 + 2 per additional class)% * dot count + 10% per additional level)
A maxed-out wind at 7 pip has (100% + 24% * 7 + 10% * 4) = 3.08x attack speed rate boost, which means it will attack every 0.45/7/3.08 = 0.02s, which is equivalent of 47.9 attacks per second, not to mention it can be further boosted by Lunar.
Strategies
With its fastest possible basic attack speed, Wind is usually used in scenarios that benefits from rapid hits such as with Devil Sword or in Treasure Chest event. However, its dps is so low that it isn't worth using over its counterparts, Typhoon or even Mighty Wind.