Paradise Druid

This creature has hexproof as long as it's untapped. (It can't be the target of spells or abilities your opponents control.)
{T}: Add one mana of any color.

Ilysian Caryatid

{T}: Add one mana of any color. If you control a creature with power 4 or greater, add two mana of any one color instead.

Urborg Elf

Quirion Explorer

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

Rattleclaw Mystic

{T}: Add {G}, {U}, or {R}.
Morph {2} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When Rattleclaw Mystic is turned face up, add {G}{U}{R}.

Sylvok Explorer

Drover of the Mighty

Drover of the Mighty gets +2/+2 as long as you control a Dinosaur.
{T}: Add one mana of any color.

Birds of Paradise

Gemhide Sliver

All Slivers have "{T}: Add one mana of any color."

Boreal Druid

Voyaging Satyr

Incubation Druid

{T}: Add one mana of any type that a land you control could produce. If Incubation Druid has a +1/+1 counter on it, add three mana of that type instead.
{3}{G}{G}: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)

Harvester Druid

{T}: Add one mana of any color that a land you control could produce.

Avacyn's Pilgrim

Arbor Elf

Fyndhorn Elves

Llanowar Elves

Naga Vitalist

{T}: Add one mana of any type that a land you control could produce.