Nightveil Dreamstealer

Encore (When this creature dies, return it to the battlefield under your control. Then, exile it.)
When Nightveil Dreamstealer enters the battlefield, draw cards equal to the number of
cards target opponent discarded this turn.
Her tune is soft, and lulling, gently making her targets
drift to sleep, all the while, she raids their subconscious,
stealing their secrets.