[Spell] Adding bonus damage and attack speed

[Darkey]

I'm looking to create a heroic ability like the Searing Arrow but with the added bonus of increased attack speed while active. Meaning it's an auto cast ability that increases the hero's attack damage and speed whilst draining mana with each attack until deactivated.

Currently stuck on how I could add the extra attack speed while the auto cast is active but not remain after it's deactivated. :| Any help is appreciated.

 

[Spartipilo]

When the unit dies, or is given the order to deactivate, or doesn't have enough mana, remove the buff.

 

[Dr Super Good]

Be aware that WC3 has a hard coded maximum of +400% faster attack speed (including buffs, items and agility stat). As such if this is a hero it might run into the attack speed limit.

Activating is an auto cast on order event. Deactivating is an auto cast off order event. Both are no target.

You could periodically check the unit every second and if it has too little mana force turn the auto cast off.