Sulfur Vent

This land enters tapped.
{T}: Add {B}.
{T}, Sacrifice this land: Add {U}{R}.

Manamorphose

Add two mana in any combination of colors.
Draw a card.

Glimpse the Impossible

Exile the top three cards of your library. You may play those cards this turn. At the beginning of the next end step, if any of those cards remain exiled, put them into your graveyard, then create a 0/1 colorless Eldrazi Spawn creature token for each card put into your graveyard this way. Those tokens have "Sacrifice this token: Add {C}."

Lotus Petal

{T}, Sacrifice this artifact: Add one mana of any color.

Deadly Dispute

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Nightscape Familiar

Blue spells and red spells you cast cost {1} less to cast.
{1}{B}: Regenerate this creature.

Goblin Electromancer

Instant and sorcery spells you cast cost {1} less to cast.

Seething Song

Clear the Mind

Target player shuffles their graveyard into their library.
Draw a card.

Spark Spray

Spark Spray deals 1 damage to any target.
Cycling {R} ({R}, Discard this card: Draw a card.)

Cabal Ritual

Add {B}{B}{B}.
Threshold — Add {B}{B}{B}{B}{B} instead if there are seven or more cards in your graveyard.

Great Furnace

Seat of the Synod

Ichor Wellspring

When this artifact enters or is put into a graveyard from the battlefield, draw a card.

Vault of Whispers

Wrenn's Resolve

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.