Lifelink

When Bloodline Necromancer enters, you may return target Vampire or Wizard creature card from your graveyard to the battlefield.

, , Sacrifice Doomed Necromancer: Return target creature card from your graveyard to the battlefield.

+2: Each player discards a card.

−X: Return target nonlegendary creature card with mana value X from your graveyard to the battlefield.

−8: You get an emblem with "Whenever a creature dies, return it to the battlefield under your control at the beginning of the next end step."

Whenever a creature an opponent controls dies, you may pay . If you do, return that card to the battlefield under your control. If it's a creature, it's a Zombie in addition to its other creature types.

: Regenerate target Zombie.

When Necromancer's Covenant enters, exile all creature cards from target player's graveyard, then create a 2/2 black Zombie creature token for each card exiled this way.

Zombies you control have lifelink.

Enchant creature

Creatures you control that are enchanted get +1/+1.

If a creature you control that's enchanted would die, return it to its owner's hand instead.

Menace

Whenever Sauron, the Necromancer attacks, exile target creature card from your graveyard. Create a tapped and attacking token that's a copy of that card, except it's a 3/3 black Wraith with menace. At the beginning of the next end step, exile that token unless Sauron is your Ring-bearer.

When Young Necromancer enters, you may exile two cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield.