Piper, Selesnya's Bark

Whenever another creature enters the
battlefield under your control, you gain
life equal to that creature's toughness.
{1}{g}{w}, {t}: Populate. (Create a token that's
a copy of a creature token you control.)
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
She is made of that, with which she uses to
sound alarm.