Amelie, Damsel in Distress

Amelie enters the battlefield under target
opponent's control.
At the beginning of your upkeep, if you don't
own Amelie, put a charm counter on her. Then
if she has three or more charm counters on her,
return her to her owner's hand and her owner
gains control of a creature you control of their
choice.
Vigilance, Deathtouch