Wailing Nightmare

Flying, menace
When Wailing Nightmare deals combat damage
to an opponent, gain control of target creature
that player controls for as long as Wailing
Nightmare is on the battlefield.
"The spirits of the Whispering Islands are naturally inclined to guide voyagers through the mists. These wraiths, however, only speak whispers of death."
—Lelonor, Mage Adept