Chameleon Colossus: This is a changeling, so he is technically an Elf. Jund/Grixis decks will not be able to remove him. He is also great against Junk, but they do have Path to Exile.
Fecundity: This is an enchantment you want to have against decks playing heavy removal or board wipes. This will insure that you can empty your hand onto the board again. Bring this in against Living End, a poor match up for us.
Fracturing Gust: You will want to board this card in against Bogles, Prison decks, Affinity, and Lantern Control. Any deck that really relies on enchantments/artifacts, bring this in.
Leyline of Vitality: This is an incredibly powerful enchantment within the Elf deck. It is HIGHLY underrated, in my honest opinion. I bring this in against decks playing Electrolyze, which includes UWR control. Obviously, this comes in against Burn, which is a far superior choice compared to Essence Warden. Burn can easily target this Elf with a spell, in response to you casting your creature spells, yielding no life gain. However, no one is expecting this enchantment game 2, so I rarely ever see Destructive Revelry coming in, unless there is a game three. Also, being able to cast this for free is back breaking against Burn.
Melira, Sylvok Outcast: This deck has zero creature removal, which makes Infect one of our worst match ups. Our only hope is us racing them or getting a Spellskite/Melira into play. Technically once these are boarded in, you're running multiple copies of them. Chord of Calling is essentially a copy of these creatures.
Scavenging Ooze: Scavenging Ooze is the best answer in green against decks abusing their graveyard. Since we have such a large amount of green mana available, we can usually eat their entire graveyard. He is a magnet for removal though.
Spellskite: This comes in against Infect/Bogles and other various decks, but mainly Infect/Bogles.
Stain the Mind: Stain the Mind is our answer to combo decks, however we have no way of searching our library for this card. So we have to hope to draw into it or race the opponent.
Craterhoof Behemoth: I have not tested this creature. Some Elf players include it. I'm not sure about it, Ezuri covers this area. If Ezuri fails, then burn them out with the Shaman.