Defiant Elf

Thornweald Archer

Naturalize

Elvish Mystic

Wirewood Pride

Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Elvish Vanguard

Whenever another Elf enters, put a +1/+1 counter on Elvish Vanguard.

Lys Alana Huntmaster

Whenever you cast an Elf spell, you may create a 1/1 green Elf Warrior creature token.

Presence of Gond

Enchant creature
Enchanted creature has "{T}: Create a 1/1 green Elf Warrior creature token."

Echoing Courage

Target creature and all other creatures with the same name as that creature get +2/+2 until end of turn.

Forest

Timberwatch Elf

{T}: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Aspect of Hydra

Target creature gets +X/+X until end of turn, where X is your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

Taunting Elf

All creatures able to block Taunting Elf do so.

Elvish Visionary

When Elvish Visionary enters, draw a card.

Llanowar Elves

Elven Farsight

Scry 3, then you may reveal the top card of your library. If it's a creature card, draw a card.