Wirewood Channeler

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

Elvish Hunter

{1}{G}, {T}: Target creature doesn't untap during its controller's next untap step.

Treetop Scout

This creature can't be blocked except by creatures with flying.

Flash of Insight

Look at the top X cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
Flashback—{1}{U}, Exile X blue cards from your graveyard. (You may cast this card from your graveyard for its flashback cost, then exile it. You can't exile Flash of Insight to pay for its own flashback cost.)

Magma Mine

{4}: Put a pressure counter on this artifact.
{T}, Sacrifice this artifact: It deals damage equal to the number of pressure counters on it to any target.

Stream of Life

Forest

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Quirion Elves

As this creature enters, choose a color.
{T}: Add {G}.
{T}: Add one mana of the chosen color.

Wellwisher

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

Gaea's Skyfolk

Wirewood Herald

When this creature dies, you may search your library for an Elf card, reveal that card, put it into your hand, then shuffle.

Island

Stroke of Genius

Cephalid Scout

Flying
{2}{U}, Sacrifice a land: Draw a card.

Pemmin's Aura

Enchant creature
{U}: Untap enchanted creature.
{U}: Enchanted creature gains flying until end of turn.
{U}: Enchanted creature gains shroud until end of turn. (It can't be the target of spells or abilities.)
{1}: Enchanted creature gets +1/-1 or -1/+1 until end of turn.