Manaless ADC (Ninja Concept)

I heard that the Riot is working on a champion named "Karadin" who is a adc runs on heat system like Rumble. And couple days ago I saw a video of team comp of all ninjas like as Jungle as Support as ADC as Top as Mid. As you can see Katarina is not a Ninja concept champion and also she is a close range high AP burst champion. So I thought of a long range ninja concept that throws a throwing knife as long range weapon using Ki like Passive- Every 5th attack the champion back-steps into a direction and shoots two knives at a target. Q- Targeting skill which when the skill is shot there will be a throwing knife mark and the next attack will do bonus damage (The passive's double shooting will deal twice the damage)Also has basic damage on the skill. W- The champion blows a smoke screen that blinds the enemy, when the smoke screen stacks up to three times, and when the skill is use after three stacks the smoke is able to travel on to another enemy champion in the range that also blinds them(Up to 3 Champions for 0.5 seconds) E- Active: When attacked the champion is switched with an allied target (allied Minion & Allied champion) Passive: Movement speed is increased when the skill is ready to use, when skill is used the movement is decreased back to original state until the skill is done with cool down. R- Throws knives with chains attached on the back of the knife. The knives hits the enemy and then are pulled out which deals damage and after it makes the enemy bleed for 1.5 second. Basic build