Birchlore Rangers
{G}
Creature -- Elf Druid Ranger
1/1
Tap two untapped Elves you control: Add one mana of any color.
Morph {G} (You may cast ~this~ face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Heritage Druid
{G}
Creature -- Elf Druid
1/1
Tap three untapped Elves you control: Add {G}{G}{G}.
Voice of the Woods
{3}{G}{G}
Creature -- Elf
2/2
Tap five untapped Elves you control: Create a 7/7 green Elemental creature token with trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)