Immaru, Lucent Ghost

Soulbond with Hive
When Immaru enters the battlefield, you may
cast one creature spell from your graveyard.
As long as Immaru is paired with another
creature, each of those creatures has +2/+2 and
"Whenever this creature deals combat damage
to a player, that player mills one card, then
that player loses X life and you draw X cards,
where X is the discarded card's mana value."
{u}{u}{u}Return Immaru to your hand.