So on MTG Arena today, I enchanted my Hanged Executioner with Kaya's Ghostform. Hanged Executioner reads in part: "{3}{W}, Exile Hanged Executioner: Exile target creature."
I activated this ability to exile both HE and one of my opponent's creatures, expecting both to go into exile and then Kaya's Ghostform to return HE to the battlefield. However, HE remained in exile. Never saw the poor guy again. Am I misunderstanding something, or was this an arena mess up?