Response: After Galadhrim Healer enters play, choose a player. Heal 1 damage from each hero controlled by that player.

"Even if your Quest did not concern us closely, you should have refuge in this City, until you were healed and refreshed."
–Celeborn, The Fellowship of the Ring

Ranged.

Response: After Marksman of Lórien enters play, choose an enemy. That enemy gets -2 until the end of the round.

"Keen are the eyes of the Elves."
–Aragorn, The Two Towers

Response: After Woodland Courier enters play, place 1 progress on a location (2 progress instead if that location has the Forest trait).

Ranged.

Response: After Greenwood Archer enters play, ready a hero.

They dwelt most often by the edges of the woods, from which they could escape at times to hunt...
–The Hobbit

Cannot attack or defend.

Response: After Galion enters play, he gets +1 until the end of the round.

"Here am I waiting and waiting down hero, while you fellows drink and make merry and forget your tasks. Small wonder if I fall asleep from weariness!"
–The Hobbit

Response: After Greenwood Defender enters play, it does not exhaust to defend until the end of the round.

...after the coming of Men they took ever more and more to the gloaming and the dusk.
–The Hobbit

Response: After you play Woodland Sentry from your hand, choose an enemy or location in play. If there is a copy of that card in the victory display, discard the chosen card.

In the Wide World the Wood–elves lingered in the twilight of our Sun and Moon but loved best the stars...
–The Hobbit

Ranged.

Response: After Legolas participates in an attack that destroys an enemy, draw 1 card.

"He stands not alone," said Legolas, bending his bow and fitting an arrow with hands that moved quicker than sight. –The Two Towers