Living Lands

All Forests are 1/1 creatures that are still lands.

Regeneration

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
{G}: Regenerate enchanted creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Thicket Basilisk

Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Desert Twister

Llanowar Elves

Craw Wurm

Sandstorm

Sandstorm deals 1 damage to each attacking creature.

Wall of Brambles

Defender (This creature can't attack.)
{G}: Regenerate this creature.

Forest

Untamed Wilds

Search your library for a basic land card, put that card onto the battlefield, then shuffle.

Cockatrice

Flying
Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.