The Swarmlord

Protection from white and from black
Whenever you cast a creature spell, put a
+1/+1 counter on The Swarmlord.
Creature spells you cast cost {1} less to cast for
each +1/+1 counter on The Swarmlord.
"Tyranids are creatures from our darkest nightmares. But remember this: they can
bleed, and they can die."