Blackwing Commander

Flying, first strike, hellbound (If this creature would be removed from the battlefield the first time, it isn't. Remove all damage and -1/-1 counters from this creature instead. If the source that would have removed this creature from the battlefield was a spell
or an ability, counter it.)
When Blackwing Commander dies or would die, create X 1/1 demon tokens with flying, where X
is the damage dealt to her this turn until now.