Pendelhaven

{T}: Add {G}.
{T}: Target 1/1 creature gets +1/+2 until end of turn.

Llanowar Elves

Heritage Druid

Tap three untapped Elves you control: Add {G}{G}{G}.

Nettle Sentinel

Nettle Sentinel doesn't untap during your untap step.
Whenever you cast a green spell, you may untap Nettle Sentinel.

Mirari

Whenever you cast an instant or sorcery spell, you may pay {3}. If you do, copy that spell. You may choose new targets for the copy.

Birchlore Rangers

Tap two untapped Elves you control: Add one mana of any color.
Morph {G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Forest

Wellwisher

{T}: You gain 1 life for each Elf on the battlefield.

Elven Ambush

Create a 1/1 green Elf Warrior creature token for each Elf you control.

Elvish Promenade

Priest of Titania

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

Biorhythm

Each player's life total becomes the number of creatures they control.

Glimpse of Nature

Whenever you cast a creature spell this turn, draw a card.

Regal Force

When Regal Force enters, draw a card for each green creature you control.

Fyndhorn Elves

Coat of Arms

Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)