So this is just my idea for a Youmuu's ghostblade rework. BTW I don't know any of the s3 items/reworks, and i don't know the formal way of saying the effects :/
1. Keeps the Passive effects of the original ghostblade
2. UNIQUE Active: Allows your champion to become untargetable for .75 seconds, and you gain 50% movement speed. You cannot attack in this state. You cannot cast skills after casting this effect for 1 second. 120 sec CD.
So basically this is a dash that allows you to get in or out of fights. It'll make the item more viable for alot of characters. I thought it would fit the whole "ghostblade" name better than the current active effect.