Kessen the Arisen

Whenever you put a +1/+1 counter on a creature
you control, you may put a -1/-1 counter on a creature you don't control. Whenever one or
more creatures with a -1/-1 counter on it dies,
choose one:
•Draw a card.
•Put a card from your graveyard on top of your library.
•Create a 1/4 green spider creature token with
reach and deathtouch.