Ghost ,The Rogue Gunner

With how Riot has been releasing more and more interesting champions, I thought of a champion that would use a new "resource" for his abilities. Ammunition, which will act sort of like energy, will fuel his abilities and his ultimate.

Passive) Ghost gets 100 ammunition, which does not increase as he levels up. Auxiliary Supplies: Gain 3/6/9 Ammunition per second.

Q) Motion Sensor: Longshot places a small device at a target location that will last for 1/2/3 minutes. The device can reveal invisible targets (not wards) which will Mark them for 6 seconds. Marked targets give Ghost vision of them and their surroundings, as well as 2%/4%/6%/8%/10% bonus AD for each Marked champion. Radius: 300. Maximum of 2 on the field at a time. Cost 20 Ammunition. Cooldown: 40 seconds

W) Tripwire: Ghost throws out a tripwire device that will stay active for 4 seconds. If an enemy champion comes into contact with the tripwire, they Trip for 1 second. In addition, they are slowed by 20% for 2 seconds. Cost 20 Ammunition. Radius: 750. Length of tripwire: 300. Cooldown: 20 seconds

E) Anti-Armor Round: Ghost next basic attack costs 20 Ammunition, and has 20/30/40 bonus armor penetration. It deals 25% bonus damage unless the target is Marked, in which case it will deal 40% bonus damage and slow the target. Range: 550. Cooldown 10/9/8/7/6 seconds

R) Empty The Clip: Ghost focuses his rifle, slowing down time in a large radius (1500) around him for 2 seconds. All targets in the area or who enter the area are slowed. Ghost selects a single target champion, unloading 5/10/15 bullets into them. Each bullet will deal 40/50/60(+50% total AD). If the target is Marked, Ghost will Lockdown the target, stunning them for as much as 3 seconds, based off the targets missing health. Cost 75 Ammunition. Cooldown: 110/90/70

Input on how to balance Ghost are welcome!