3 mana-“All minions and your general Attack themself”
This is how i would change it because usually this card is a lot more oppressive in the late game when you can clear the Board with it and still Developed big minions. Vaath loves his overloads so with That change the later you play it the bigger the damage.
Another option, similar but different
3 mana-"All minions Attack themself. Your general take damage equal to half of the Total damage done"
What do you think?