Combo based champion

I was thinking of a champion whos skills were based on combinations of button mashing, i dont mean like with syndra putting a ball on the ground and launching it will stun, i mean proper combos.

for example: Q->E->W->Q would be a knockup etc

so the basics for this champion:

resource: CD, resourceless Range: Melee

Passive: activating a skill gives the user 3 seconds to complete a combination, in this time cooldowns are halved. Passive extends by 2 seconds -> 1 second for each combination completed. Cooldown of 6 seconds.

Q: heavy punch, next attack deals bonus physical damage based on bonus AD. CD 1 second W: Low sweep, next attack will stun the enemy for 0.5 seconds, damage increases based on AP. CD 3 seconds E: Short range grab, grabs the nearest unit in range (range would be like darius grab) prioritises champions (lowest hp% 1st), then monsters, then siege minions, then minions. hovering the mouse over a unit will prioritise that unit. CD 10 seconds R: Focus, all units around you are slowed and have thier attack speed slowed for 3 seconds, passive duration is doubled. Passively grants bonus mvmnt speed when a skill is landed. CD 60 seconds

Combos: Q,Q,Q deals double Q dmg +%current hp E,W,Q Knocks up enemy unit Q, W, Q Slows the enemy by 40% for 2 seconds W, Q, Q Knocks back the enemy