Manacharged Strike

Imbues your next auto-attack with Arcane energy, consuming mana to deal bonus damage. Dealing damage this way has a chance to make you go into a Mana-crazed Delirium, increasing your spell power by 10% of your Intellect, stacking up every second. While active your Arcane spells cost no mana, but maintaining the effect drains mana every second.