Valeera Sanguinar by Alixeniv

Preparation: Reset the cooldown of your primary skills; OR reduce the costs of them permanently (Level 20);

Deadly Poison: Your basic attacks poison your enemy;

Dismantle: Silence your enemy for X seconds;

Sprint;

???: Adds a slow to Flying Dagger and Fan of Knives;

Safestep: Receives less dmg for 2 seconds after Shadowstep or Darkstep;

Teleport Master: Increases Shadowstep/Darkstep's range by X%;

Revitalize: Spend your combo points to regen X health in 5 seconds. Each combo pt increases the amount of health you regen;

Adrenaline Rush: Activate to increase your energy regen during X seconds.

PS: If she feels very op, we can also tune her passive and make it with 5 points. Then "Q" could generate 2 points, while "W" and "E" generate only 1.

Having in mind that she's a rogue, there's no way I could leave a stealth mechanic out of her kit. Nevertheless, this is not another hero with full time stealth like Nova or Zera. In this kit, her stealth involves getting close to the right enemies or escaping a tough situation. With her flying dagger you can reveal enemies that are out of your vision, making it possible for you to shadowstep to them if they're on the other side of a wall or in a bush, for instance. You can also use this skill to interrupt your enemies when they're channeling an objective.

PS: You can Shadowstep/Darkstep to your allies, enemies, minions, mercs, totems etc. You can't use the ability on structures.
PS2: Valeera uses Energy as her resource. Energy regens for X amount each second.
PS3: The secondary abilities don't share cooldown with the primary ones. Valeera can use her secondaries anytime she unlocks her passive/combat trait.

This way, for instance, you can gather 1 point on minions, shadowstep to the enemy hero for another one, use backstab for the third, activate your passive, and use kidney shot. OR you can gather one point, shadowstep to the enemy hero for another one, use backstab for the third, and darkstep back to an ally safely. OR you can gather 3 pts, vanish with darkstep before ganking, shadowstep to the enemy (as it won't break your stealth) and start a new combo. OR, during a teamfight, you can darkstep to the frontline enemy, getting stealthed, and shadowstep to a squishy target, who usually stays in the back. Have in mind that all of these abilities (including the secondary ones) demand energy, so that's what will limit "nonstop combos", as you'll need time to regain the energy spent.