Dawn Summers, Fabled Key

Battle cry (Whenever this creature attacks, each
other attacking creature gets +1/+0 until end of
turn.)
When Dawn Summers enters the battlefield or dies,
create a 1/1 black Bat creature token with flying.

“You've made these amazing sacrifices, for me… for
the world. I've always wondered if I could do
something like that. If I could be that brave. It's
kinda cool to find out that I can. I'll do it.
I want to do it.”