Arbor Elf

Natural Affinity

All lands become 2/2 creatures until end of turn. They're still lands.

Llanowar Elves

Ramunap Excavator

Fyndhorn Elves

Forest

Zendikar's Roil

Landfall — Whenever a land enters the battlefield under your control, create a 2/2 green Elemental creature token.

Tireless Provisioner

Landfall — Whenever a land enters the battlefield under your control, create a Food token or a Treasure token. (Food is an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life." Treasure is an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Yedora, Grave Gardener

Whenever another nontoken creature you control dies, you may return it to the battlefield face down under its owner's control. It's a Forest land. (It has no other types or abilities.)

Lotus Cobra

Landfall — Whenever a land enters the battlefield under your control, add one mana of any color.