Fyndhorn Elves

Forest

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

Whenever this creature attacks, untap each other creature you control.

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

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

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

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

{3}, {T}: Search your library for an Elf permanent card, put it onto the battlefield, then shuffle.

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

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

When this creature enters, target opponent loses life equal to the number of Elves you control.

Return a Forest you control to its owner's hand: Untap target creature. Activate only once each turn.