Enbit, Forgotten Sandsage

Whenever a zombie creature you control deals
combat damage to a player or dies, target player
mills two cards.
At the beginning of your upkeep, you may cast a creature card from target player's graveyard.
You may spend mana as though it were mana of
any type to cast that spell. It becomes a black
zombie in addition to its other types. If that
creature would die, exile it instead.