Gruul Signet

Fellwar Stone

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

Forest

Dimir Signet

Fire Diamond

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

Island

Izzet Signet

Orzhov Signet

Marble Diamond

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

Moss Diamond

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

Swamp

Selesnya Signet

Sol Ring

Azorius Signet

Everflowing Chalice

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.)
Everflowing Chalice enters with a charge counter on it for each time it was kicked.
{T}: Add {C} for each charge counter on Everflowing Chalice.

Liquimetal Torque

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

Mountain

Charcoal Diamond

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

Boros Signet

Arcane Signet

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

Go-Shintai of Life's Origin

{W}{U}{B}{R}{G}, {T}: Return target enchantment card from your graveyard to the battlefield.
Whenever Go-Shintai of Life's Origin or another nontoken Shrine you control enters, create a 1/1 colorless Shrine enchantment creature token.