Thought Vessel

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

Sol Grail

As Sol Grail enters, choose a color.
{T}: Add one mana of the chosen color.

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.

Charcoal Diamond enters tapped.
{T}: Add {B}.

Indestructible (Effects that say "destroy" don't destroy this artifact.)
{T}: Add one mana of any color.

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

{T}, Sacrifice two creatures: Return target creature card from your graveyard to the battlefield.