Dark Ritual

Jet Medallion

Black spells you cast cost {1} less to cast.

Sol Ring

Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Ashnod's Altar

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Sauron, the Necromancer

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.