Dire Strike Ballista.

Item concept: Dire Strike Ballista

Stats: 40 AD 20% Crit chance 10 Armor pen Unique Passive: Dire Strike: Auto attacks against turrets have a chance to crit. The crit chance against turrets is 75% of your current crit chance.

Price: 3200 gold

Recipe: (1100 gold) + (350 gold) + (350 gold) + (800 gold) + 600 gold.

I was thinking of an item that would help split pushing champions when they're behind. The armour pen is to help bypass some turret armor and the crit chance is supposed to help with dealing extra damage to turrets. Because of this items low ad, it's more of a mid game item when you have other ad and crit items and wouldn't be much of an asset in fights. This item is for the desperate situation where your team can't possibly win a team fight and split pushing is the only chance. I hope I hit the mark with this idea. Sounds cool? Underpowered? Overpowered? Balanced? Any feedback or suggestions?