Springleaf Drum

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

Thought Vessel

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

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

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

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

Sky Diamond enters the battlefield tapped.
{T}: Add {U}.

{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.

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

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

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

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

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

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

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