Aspet's Einladungsschreiben

As Aspet's Einladungsschreiben enters
the battlefield, an opponent of your choice
gains control of it.
Whenever you cast an instant or sorcery spell,
the owner of Aspet's Einladungsschreiben
may copy it and may choose new targets for
the copy unless you pay {1}
{3}:Target opponent gains conroll of Aspet's
Einladungschreiben.