: Add .
, Sacrifice Crystal Vein: Add .

Ebon Stronghold enters tapped.
: Add .
, Sacrifice Ebon Stronghold: Add .

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

Choose a nonland card name. Target player reveals their hand and discards all cards with that name.
Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant creature card in a graveyard
When Animate Dead enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with Animate Dead." Return enchanted creature card to the battlefield under your control and attach Animate Dead to it. When Animate Dead leaves the battlefield, that creature's controller sacrifices it.
Enchanted creature gets -1/-0.

As an additional cost to cast this spell, discard X cards.
Sickening Dreams deals X damage to each creature and each player.

Discard two cards: Create a 2/2 black Zombie creature token.

Search your library for up to three creature cards, put them into your graveyard, then shuffle.

When Hidden Horror enters, sacrifice it unless you discard a creature card.

Return target creature card from your graveyard to the battlefield.
Flashback—Sacrifice three creatures. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

When Diabolic Servitude enters, return target creature card from your graveyard to the battlefield.
When the creature put onto the battlefield with Diabolic Servitude dies, exile it and return Diabolic Servitude to its owner's hand.
When Diabolic Servitude leaves the battlefield, exile the creature put onto the battlefield with Diabolic Servitude.