Hot to make convention skill?

I wanna make skill that convent mana into lumber... how ? I seached for possibles skills but i didnt found anything ...

Dont think it can be done using the standard object editor, however trying snooping around at transmute...blah probs wont work.

You gota make a trigger, i dont know how you want it done.

Lets say it converts 50 mana into 50 lumber you would make a blank ability that u just press, like water elemental but nothing is summoned....and run a trigger:

E:Unit begins casting an ability
C:ability equals to yourdummyability
actions: Player - add 50 lumber to owner of casting unit

if you wanted it however to make it consume all ur mana into wood, you would have to run a the same trigger but in actions, youd have to detect how much mana the unit has, then get that number and give the number to the player in lumber. and add to him. now for this you'd have to store it in a interger, i cant give u a relivant example now but maybe someoen else could as im not at home!