I don't play well, but ying is probably my best champion. Here is a basic FL build
Increase your Ultimate charge rate by 30%.
Gain 21% Movement Speed.
Your weapon shots gain +30% Lifesteal.
Deal an additional 200 damage to an enemy if you hit them with all 5 shots of Illusory Mirror.
Reduce your active Cooldowns by 5s after getting an Elimination.
Spawn an Illusion with 60% Health when you swap to the spot of a dead Illusion.
Increase the Movement Speed of Illusions by 16% during Shatter.
Heal for 26% of the damage dealt by Shatter.
Reduce the Cooldown of Illusion by 1.5s when an Illusion dies to an enemy.