Giant Oyster

You may choose not to untap Giant Oyster during your untap step.
{T}: For as long as Giant Oyster remains tapped, target tapped creature doesn't untap during its controller's untap step, and at the beginning of each of your draw steps, put a -1/-1 counter on that creature. When Giant Oyster leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature.

Rainbow Crow

Flying
{1}: Rainbow Crow becomes the color of your choice until end of turn.

Warthog

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Giant Slug

{5}: At the beginning of your next upkeep, choose a basic land type. Giant Slug gains landwalk of the chosen type until the end of that turn. (It can't be blocked as long as defending player controls a land of that type.)

Sabretooth Tiger

Wild Elephant

Killer Whale

{U}: Killer Whale gains flying until end of turn.

Endless Cockroaches

When Endless Cockroaches dies, return it to its owner's hand.

Grizzly Bears

Bay Falcon

Jungle Lion

Wild Dogs

At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of Wild Dogs.
Cycling {2} ({2}, Discard this card: Draw a card.)

Gang of Elk

Whenever Gang of Elk becomes blocked, it gets +2/+2 until end of turn for each creature blocking it.

Giant Crab

{U}: Giant Crab gains shroud until end of turn. (It can't be the target of spells or abilities.)

Giant Mantis

Reach (This creature can block creatures with flying.)

War Falcon

Flying
War Falcon can't attack unless you control a Knight or a Soldier.

Coral Eel

Giant Cockroach

Dwarven Pony

{1}{R}, {T}: Target Dwarf creature gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)

Narwhal

Gibbering Hyenas

Gibbering Hyenas can't block black creatures.

Giant Spider

Giant Caterpillar

{G}, Sacrifice Giant Caterpillar: Create a 1/1 green Insect creature token with flying named Butterfly at the beginning of the next end step.

River Boa

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate River Boa.

Dire Wolves

Dire Wolves has banding as long as you control a Plains. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Giant Octopus

Giant Tortoise

Giant Tortoise gets +0/+3 as long as it's untapped.

Aurochs

Trample
Whenever Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

Tarpan

Giant Albatross

Flying
When Giant Albatross dies, you may pay {1}{U}. If you do, for each creature that dealt damage to Giant Albatross this turn, destroy that creature unless its controller pays 2 life. A creature destroyed this way can't be regenerated.

Mist Raven

Flying
When Mist Raven enters, return target creature to its owner's hand.

Tree Monkey

Firefly

Flying
{R}: Firefly gets +1/+0 until end of turn.

Pale Bears

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Timber Wolves

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Glowing Anemone

When Glowing Anemone enters, you may return target land to its owner's hand.

Giant Shark

Giant Shark can't attack unless defending player controls an Island.
Whenever Giant Shark blocks or becomes blocked by a creature that has been dealt damage this turn, Giant Shark gets +2/+0 and gains trample until end of turn.
When you control no Islands, sacrifice Giant Shark.

Camel

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
As long as Camel is attacking, prevent all damage Deserts would deal to Camel and to creatures banded with Camel.

Cave Tiger

Whenever Cave Tiger becomes blocked by a creature, Cave Tiger gets +1/+1 until end of turn.

Fire Ants

{T}: Fire Ants deals 1 damage to each other creature without flying.

Black Cat

When Black Cat dies, target opponent discards a card at random.

Gorilla Pack

Gorilla Pack can't attack unless defending player controls a Forest.
When you control no Forests, sacrifice Gorilla Pack.