Lol, you could make thunderfury&manta, like S&Y. Blink to opponent & create one/two illusion(s) of you/them, and slow.
Seriously, cool item. good we've established that it is not blink. I really like it, T-up
Wait up, you could get both these items in a different inventory slot, then you'd have S&Y, but with + 60 stats and real good effects. Bloodseka for example could blink and slow other people, and illusion, but still have his favourite orb item(s)(ish). Is this quite imba, or is the additional 5200 gold too much?
Oh well, if you did combine them, it would be imba.
And if you're going to make it a twin brother of manta, why not make the icon an axe? Or better yet, make manta a sword icon. That would seem like super S&Y.