Fellwar Stone

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

Sol Ring

Charcoal Diamond

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

Silver Myr

Dimir Signet

Sky Diamond

Star Compass

Star Compass enters tapped.
{T}: Add one mana of any color that a basic land you control could produce.

Arcane Signet

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

Lazav, Dimir Mastermind

Hexproof
Whenever a creature card is put into an opponent's graveyard from anywhere, you may have Lazav, Dimir Mastermind become a copy of that card, except its name is Lazav, Dimir Mastermind, it's legendary in addition to its other types, and it has hexproof and this ability.

Leaden Myr

Commander's Sphere

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