Gelth, Deceitful Visitors

Flying
When Gelth, Deceitful Visitors enters the
battlefield, exchange control of Gelth, Deceitful
Visitors and up to one target creature an oppo-
nent controls. If you don't make an exchange,
sacrifice Gelth, Deceitful Visitors. This ability
can't be countered except by spells and abilities.
(This effect lasts indefinitely.)