To earn gold?

Last hitting creeps with spear shot can be the only way to earn cash on particular hard lanes.

Spear shot costs only 30 mana on 4 sec cd. With some lvling on the way it will not be that hard to maintain enaugh mana for further stun->heart->spear combo.

you said on spear shot "Plus it can last hit minions" why the hell would you waste mana on a minion?

i suggest checking out ArP runes. Not like that AD runes are gonna be a gamechanger :P

and the frozen mallet's helpful for some extra health too ^_^

I think you should also add a frozen mallet so that no one can escape you, since Aegis of zeonia has a long cooldown and also improve brutalizer into a youmuu's ghostblade