Mana Geode

When Mana Geode enters, scry 1.
{T}: Add one mana of any color.

Rakdos Signet

{T}, Tap an untapped creature you control: Add one mana of any color.

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

Fire Diamond enters tapped.
{T}: Add {R}.

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

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

Marble Diamond enters tapped.
{T}: Add {W}.

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

{T}, Sacrifice Lotus Petal: Add one mana of any color.

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

{T}: Add one mana of any color that a land an opponent controls could produce.

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

Moss Diamond enters tapped.
{T}: Add {G}.

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