Elvish Champion

Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

Elvish Clancaller

Other Elves you control get +1/+1.
{4}{G}{G}, {T}: Search your library for a card named Elvish Clancaller, put it onto the battlefield, then shuffle.

Sacrifice Elvish Eulogist: You gain 1 life for each Elf card in your graveyard.

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

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

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Create a 1/1 green Elf Warrior creature token for each Elf you control.

Whenever Copperhorn Scout attacks, untap each other creature you control.

Steel Leaf Champion can't be blocked by creatures with power 2 or less.

Flash (You may cast this spell any time you could cast an instant.)
You may cast green creature spells as though they had flash.

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

Whenever another creature enters, you gain 1 life.

{T}: Put a +1/+1 counter on target creature for each Elf you control.

Other Elves you control get +1/+1.
{G}, {T}: Create a 1/1 green Elf Warrior creature token.

Whenever Rhys the Exiled attacks, you gain 1 life for each Elf you control.
{B}, Sacrifice an Elf: Regenerate Rhys the Exiled.