Zhur-Taa Druid

{T}: Add {G}.
Whenever you tap this creature for mana, it deals 1 damage to each opponent.

Llanowar Elves

Llanowar Mentor

{G}, {T}, Discard a card: Create a 1/1 green Elf Druid creature token named Llanowar Elves. It has "{T}: Add {G}."

Sisters of the Flame

Simian Spirit Guide

Llanowar Tribe

Fyndhorn Elves

Birds of Paradise

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.

Sacellum Godspeaker

{T}: Reveal any number of creature cards with power 5 or greater from your hand. Add {G} for each card revealed this way.