Priest of Titania

{T}: Add {G} for each Elf on the battlefield.

Paradise Mantle

Equipped creature has "{T}: Add one mana of any color."
Equip {1}

Sylvan Caryatid

Defender, hexproof
{T}: Add one mana of any color.

Llanowar Elves

Simic Locket

{T}: Add {G} or {U}.
{G/U}{G/U}{G/U}{G/U}, {T}, Sacrifice this artifact: Draw two cards.

Birds of Paradise

Bloom Tender

Vivid — {T}: For each color among permanents you control, add one mana of that color.

Elvish Mystic

Fyndhorn Elves

Talisman of Curiosity

{T}: Add {C}.
{T}: Add {G} or {U}. This artifact deals 1 damage to you.

Arcane Signet

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

Sol Ring

Fellwar Stone

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

Kinnan, Bonder Prodigy

Whenever you tap a nonland permanent for mana, add one mana of any type that permanent produced.
{5}{G}{U}: Look at the top five cards of your library. You may put a non-Human creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.