Mycenor, the First Hive

When Mycenor, the First Hive enters the battlefield mill 4 cards.

Host-dependent 5 ( attach this creature onto another when it enters the battlefield and give it that many +1/+1 counters)

{2}{b/g}{b/g}: Mill 6 cards, lose 5 life.
As long as you have less life than your opponent, sources you and your opponent control deal twice as much damage.