Hero Suggestion: Mirage the Stealth Assassin

Mirage the Stealth Assassin
Appearance: She’s a female soldier wearing standard military attire, but she wears a hood and a mask that covers her mouth, so the only thing we see of her face are her eyes.
Desc: A lethal sniper. Powerful abilities allow her to efficiently take out opponents one by one, but vulnerable if focused.
Info:
Element: Mech
Faction: Mercenaries
Stat Overview: Low HP, Low Armor, High Damage
Weapon: Deathstalker Rifle (Sniper,1 round, med reload speed)
Skills:
Bronze: Cloak and Dagger- This hero turns invisible for up to x seconds. Taking any damage or attacking will break the invisibility. If you break out of invisiblity with an attack, that attack deals bonus damage and heal block for x seconds.
Silver: Sleep Dart - Shoots a target with a powerful tranquilizer dart. The target will be stunned for 30 seconds, but has a 50% chance to be cured of it if damaged. If this hero has a charge of Deadeye, the affected hero’gold skill, if it has one, is disabled for the duration.
Gold: Deadeye -If this hero headshots an opponent, that target is marked and this hero gains a charge of Deadeye. Each charge gives this hero x bonus damage and 5% critical hit chance, but all charges will be depleted if she lands a critical hit. An opponent marked by this skill cannot turn invisible.
Platinum: Sharpshooter - This hero’s critical hits ignore any shield or armor buffs on the target. Each time she critically hits an opponent, that target takes extra damage and is slowed for x seconds
Background: The assassin only known as Mirage is known for her deadliness, but her origin remains a mystery. Some say she was the young daughter of a Magistrate gunsmith, abducted and raised by Wesson to act as his assassin and bodyguard, until she escaped. Some say she was a result of the mysterious experiments that occured in Morlock’s Den. Whichever of these stories are true, her lethality is unquestionable, and woe be anyone who find themselves on her crosshairs.
Comment and feedback is appreciated.