Windfury type spell? Possible?

[BassZ]

Hey i was wondering if it was posible to make a spell that had a 20% chance on hit to do 2 extra attacks with + x extra damage. Anyone know if this is posible? if so how do i do this.

 

[Drunken_God]

use critical strike
and set the damage bonus to what you want

 

[linamus]

Event: unit attacks
Conditions: random integer from 1 to 100 lesser than or equal to 20
Actions: order your unit to damage unit (and repeat action)

Plain trigger but if you want I can expand it