Is this possible?

Is it possible to make a unit that isn't able to attack unless he has enough mana?
Example: I'm making a campaign about a magician, but I don't want to make it so he has infinite energy blasts like your standard Archwizard or Bloodmage.

Also, this is along the same lines, is it possible to mkae an attack that requires 1 lumber to use (I plan on making a mod where archers have to have arrows)

*Edit* Yes and I am using a TFT.

You could possibly use Unit - Add/Remove ability to remove the Attack ability. I think this is possible, but not for certain. Just check for current mana/lumber. Do a thing that subtracts mana/lumber on attack, also.

You can have an ability based off of Cold Arrows or Fire Arrows so he can do a magical blast. And when he's out of mana, he can use a melee attack.