Have

Heedless One

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

Taunting Elf

All creatures able to block Taunting Elf do so.

Killer Bees

Flying
{G}: Killer Bees gets +1/+1 until end of turn.

Desert Twister

Elvish Aberration

{T}: Add {G}{G}{G}.
Forestcycling {2} ({2}, Discard this card: Search your library for a Forest card, reveal it, put it into your hand, then shuffle.)

Lava Burst

Lava Burst deals X damage to any target. If Lava Burst would deal damage to a creature, that damage can't be prevented or dealt instead to another permanent or player.

Forest

Elvish Guidance

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional {G} for each Elf on the battlefield.

Ambush Commander

Forests you control are 1/1 green Elf creatures that are still lands.
{1}{G}, Sacrifice an Elf: Target creature gets +3/+3 until end of turn.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Marhault Elsdragon

Rampage 1 (Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)

Emerald Medallion

Green spells you cast cost {1} less to cast.

Fyndhorn Elder

Skyshroud Claim

Search your library for up to two Forest cards, put them onto the battlefield, then shuffle.

Fires of Yavimaya

Creatures you control have haste.
Sacrifice Fires of Yavimaya: Target creature gets +2/+2 until end of turn.

Wellwisher

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

Elvish Bard

All creatures able to block Elvish Bard do so.

Crosswinds

Rolling Thunder

Rolling Thunder deals X damage divided as you choose among any number of targets.

Upwelling

Players don't lose unspent mana as steps and phases end.

Primitive Etchings

Reveal the first card you draw each turn. Whenever you reveal a creature card this way, draw a card.

Llanowar Sentinel

When Llanowar Sentinel enters the battlefield, you may pay {1}{G}. If you do, search your library for a card named Llanowar Sentinel, put that card onto the battlefield, then shuffle.

Alpha Status

Enchant creature
Enchanted creature gets +2/+2 for each other creature on the battlefield that shares a creature type with it.

Priest of Titania

{T}: Add {G} for each Elf on the battlefield.

Rofellos, Llanowar Emissary

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

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

Venom

Enchant creature
Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat.

Centaur Glade

{2}{G}{G}: Create a 3/3 green Centaur creature token.

Pack Hunt

Search your library for up to three cards with the same name as target creature, reveal them, put them into your hand, then shuffle.

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Llanowar Elves

One with Nature

Enchant creature
Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Wirewood Channeler

{T}: Add X mana of any one color, where X is the number of Elves on the battlefield.