Reylina, the Whisperer

Flash
Reylina, the Whisperer can't be countered.
Pay 5 life; Exile Reylina, the Whisperer; search
your library for a Demon card and place it onto
the battlefield under your control and it has
"When this creature leaves the battlefield return Reylina, the Whisperer from exile to your hand."
"My words, your demise."