Swamp

Bloodsoaked Altar

{T}, Pay 2 life, Discard a card, Sacrifice a creature: Create a 5/5 black Demon creature token with flying. Activate only as a sorcery.

Infectious Curse

Enchant player
Spells you cast that target enchanted player cost {1} less to cast.
At the beginning of enchanted player's upkeep, that player loses 1 life and you gain 1 life.

Accursed Witch

Spells your opponents cast that target Accursed Witch cost {1} less to cast.
When Accursed Witch dies, return it to the battlefield transformed under your control attached to target opponent.

Accursed Witch // Infectious Curse

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Forever Young

Put any number of target creature cards from your graveyard on top of your library.
Draw a card.

Murder

Bone Splinters

As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Returned Centaur

When Returned Centaur enters, target player mills four cards.

Graveyard Shovel

{2}, {T}: Target player exiles a card from their graveyard. If it's a creature card, you gain 2 life.