Seanne, Broken Screams

Seanne, Broken Screams enters the battlefield
with a number of +1/+1 counters equal to the
amount of mana spent to cast it.
Whenever Seanne is dealt damage, remove a
+1/+1 counter on Seanne and create a 1/1
black Skeleton creature token.
Whenever another nonskeleton creature dies,
put a +1/+1 counter on Seanne.