Marble Diamond

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

Emerald Medallion

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

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

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

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

{T}: Add {C}.
{T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

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