Wood Elves

When Wood Elves enters, search your library for a Forest card, put that card onto the battlefield, then shuffle.

Lathril, Blade of the Elves

Menace
Whenever Lathril, Blade of the Elves deals combat damage to a player, create that many 1/1 green Elf Warrior creature tokens.
{T}, Tap ten untapped Elves you control: Each opponent loses 10 life and you gain 10 life.

Fyndhorn Elves

Canopy Tactician

Other Elves you control get +1/+1.
{T}: Add {G}{G}{G}.

Llanowar Elves

Elvish Archdruid

Other Elf creatures you control get +1/+1.
{T}: Add {G} for each Elf you control.

Marwyn, the Nurturer

Whenever another Elf you control enters, put a +1/+1 counter on Marwyn, the Nurturer.
{T}: Add an amount of {G} equal to Marwyn's power.

Priest of Titania

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

Circle of Dreams Druid

{T}: Add {G} for each creature you control.

Elvish Mystic

Wirewood Channeler

{T}: Add X mana of any one color, where X is the number of Elves on the battlefield.