Yorrick ult concept

I was talking about Yorick with a friend and we came up with an ult concept. The ult will work like this:

1. Position; Yorick chooses a place on the map and uses his ult. (probably under turret or in a bush)
2. Activate; Yorick can't move, but a special goul will spawn next to Yorrick. (If you hit spacebar, the camera won't focus on Yorick, but the goul instead)
3. You are now able to move this fast, melee goul freely, as long as he's in range of ult. (I don't know what range)
4. When you reach any champion on the map the goul will transform into that champion and is able to use its Q, E and W as long as it's not on cooldown. (For example, a champion just used its Q and Yorrick copies that champion, Yorick has to wait until it's of cooldown. After that he can use that ability.
5. Cancel Ult; Although, when Yorrick takes damages or hits R again, ult will stop immediately. Health and damage of the copied champion is reduced by 50%.

Let me know what you think. Is it original? Do you get the idea? Does it fit with League of Legends. Can this be balanced? Thanks for reading!

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