During a game of Standard Brawl, opponent exiled my Restless Razorkin with Turncoat Kunoichi without paying the Sneak cost.
I airbent the Turncoat and other creatures with Avatar's Wrath. I didn't see Razorkin return to the battlefield but was able to attack with and trigger the Razorkin on subsequent turns.
Opponent recast Turncoat and I was able to see my tapped Razorkin still attached to the Turncoat as though it was exiled. Opponent also exiled my Haliya with the same turncoat.
I later cast Day of Judgement, killing the Turncoat. My Haliya returned normally but Razorkin was still visibly attached to the Turncoat in the graveyard.

Attached is an image of the Turncoat with a "hollow" attached Razorkin.