Attacking stacks charges for abilities

Hi.  Sorry if this is in the wrong area, this forum is confusing and HUGE.

Anyway, I am getting pretty heavy into my project and have a pretty solid understanding of RPGmaker and am starting to need more and more complicated processes in my game.

My character has an item called a blood blade, and he can cast magic whenever his dagger is full of blood.  It fills itself with nearby blood magically so if he slices somebody it will fill with blood letting him cast magic next turn.  Basically what I am looking for here is a script that will either create a new resource pool for magic spells (i.e. blood points) which are gained through attacking with basic attacks, or a script which will allow me to apply a status ailment on my main character whenever he attacks with a melee attack.  

The second option will work (hopefully) with another script which allows me to restrict skills to only being cast when a player is inflicted with a state.  (It also removes the status ailment when the skill is used)

If anybody has any other ideas or solutions to my problem I am open to pretty much anything that gets the job done.  The main thing I need is that basic attacks build a charge which the player can spend the following turn to do a number of spells.

Thanks in advance for your time,

Salty.