If Blink Dagger was in LoL

I've played very little DotA however there is a item that gives you a flash-like active

My idea is to have a Blink Dagger (similar item, maybe with stats however inefficient) in LoL but like Tiamat and Hydra it is Melee only, and to have an active similar to this.

Unique Active: Blink to target location 400 units away. If Champion is using the Flash summoner spell then when it is off cooldown then it is increased by 75 units (The Dagger). If Champion is using the Ghost summoner spell then when it is off cooldown then after blinking your champion's movespeed is increased by 27% for 2 seconds. If Champion is using the Teleport summoner spell then when it is off cooldown then you're blink can be used to target to units and towers. If this occurs then Blink Dagger's cooldown is decreased to 240 seconds from 300, (These numbers are based off Ezreal's E blink and Ghost)

I know what you are thinking. OMG fucking Zed will wreck my face even harder, but then I ask you, who needs this mobility the most. Low mobility champions of course, Most likely those who'd run possibly Flash and teleport (most bruisers/top laners) or Flash and ghost, and finally Ghost and Teleport (Nasus and Olaf).

Pros

• Gives Melee champs ways to engage with out committing they're ability to escape (diversity)

• Benefits Top laners in general with additional benefits (mainly tanks with a lack of mobility)

Cons

• Most likely to be very inefficient stat wise or have no stats for very costly price

• Most useful in mid game, somewhat useless late game. The raw stats would most likely be better

• If it is viable on Zed everyone will unistall LoL or everyone will main Zed (diversity, sarcasm)

I recognize my idea is not perfect, but if you got a better idea for a blink dagger like item in LoL then please post in comment below.