Crown of Vigor

Enchant creature
Enchanted creature gets +1/+1.
Sacrifice Crown of Vigor: Enchanted creature and other creatures that share a creature type with it get +1/+1 until end of turn.

Tribal Unity

Creatures of the creature type of your choice get +X/+X until end of turn.

Tranquil Thicket

Tranquil Thicket enters tapped.
{T}: Add {G}.
Cycling {G} ({G}, Discard this card: Draw a card.)

Wirewood Elf

Wirewood Pride

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

Wirewood Lodge

{T}: Add {C}.
{G}, {T}: Untap target Elf.

Wirewood Herald

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

Mythic Proportions

Enchant creature
Enchanted creature gets +8/+8 and has trample.

Wellwisher

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

Overwhelming Instinct

Whenever you attack with three or more creatures, draw a card.

Birchlore Rangers

Tap two untapped Elves you control: Add one mana of any color.
Morph {G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Heedless One

Trample
Heedless One's power and toughness are each equal to the number of Elves on the battlefield.