Tsunami

Become the Avalanche

Draw a card for each creature you control with power 4 or greater. Then creatures you control get +X/+X until end of turn, where X is the number of cards in your hand.

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.

Leaf-Crowned Visionary

Other Elves you control get +1/+1.
Whenever you cast an Elf spell, you may pay {G}. If you do, draw a card.

Fyndhorn Elves

Adaptive Automaton

As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Other creatures you control of the chosen type get +1/+1.

Imperious Perfect

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

Ursapine

{G}: Target creature gets +1/+1 until end of turn.

Canopy Tactician

Other Elves you control get +1/+1.
{T}: Add {G}{G}{G}.

Earthquake Dragon

This spell costs {X} less to cast, where X is the total mana value of Dragons you control.
Flying, trample
{2}{G}, Sacrifice a land: Return this card from your graveyard to your hand.

Elvish Mystic

Seeker of Skybreak

Aggressive Mammoth

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Other creatures you control have trample.

Galadhrim Brigade

Squad {1}{G} (As an additional cost to cast this spell, you may pay {1}{G} any number of times. When this creature enters, create that many tokens that are copies of it.)
Other Elves you control get +1/+1.

Circle of Dreams Druid

{T}: Add {G} for each creature you control.

Mercy Killing

Target creature's controller sacrifices it, then creates X 1/1 green and white Elf Warrior creature tokens, where X is that creature's power.

Elven Ambush

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

Craterhoof Behemoth

Haste
When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control.

Forest

Skarrg Goliath

Trample
Bloodrush — {5}{G}{G}, Discard this card: Target attacking creature gets +9/+9 and gains trample until end of turn.

Choke

Islands don't untap during their controllers' untap steps.

Wellwisher

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

Llanowar Elves

Crash the Party

Create a tapped 4/4 green Rhino Warrior creature token for each tapped creature you control.

Elvish Archdruid

Other Elf creatures you control get +1/+1.
{T}: Add {G} for each Elf you control.