Grothama, All-Devouring

Other creatures have "Whenever this creature attacks, you may have it fight Grothama, All-Devouring."
When Grothama leaves the battlefield, each player draws cards equal to the amount of damage dealt to Grothama this turn by sources they controlled.

Snow-Covered Swamp

Bellowing Tanglewurm

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Other green creatures you control have intimidate.

Elderscale Wurm

Trample
When this creature enters, if your life total is less than 7, your life total becomes 7.
As long as you have 7 or more life, damage that would reduce your life total to less than 7 reduces it to 7 instead.

Boneyard Wurm

Boneyard Wurm's power and toughness are each equal to the number of creature cards in your graveyard.

Snow-Covered Forest

Fist of Suns

You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells you cast.

Sifter Wurm

Trample
When this creature enters, scry 3, then reveal the top card of your library. You gain life equal to that card's mana value.

Autochthon Wurm

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Trample

Siege Wurm

Morophon, the Boundless

Changeling (This card is every creature type.)
As Morophon enters, choose a creature type.
Spells of the chosen type you cast cost {W}{U}{B}{R}{G} less to cast. This effect reduces only the amount of colored mana you pay.
Other creatures you control of the chosen type get +1/+1.

Penumbra Wurm

Trample
When this creature dies, create a 6/6 black Wurm creature token with trample.

Voracious Wurm

This creature enters with X +1/+1 counters on it, where X is the amount of life you've gained this turn.

Duskdale Wurm

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Havenwood Wurm

Flash (You may cast this spell any time you could cast an instant.)
Trample

Conifer Wurm

Trample
{3}{G}: This creature gets +X/+X until end of turn, where X is the number of snow permanents you control.

Ravager Wurm

Riot (This creature enters with your choice of a +1/+1 counter or haste.)
When this creature enters, choose up to one —
• This creature fights target creature you don't control.
• Destroy target land with an activated ability that isn't a mana ability.

Metamorphic Wurm

Threshold — This creature gets +4/+4 as long as seven or more cards are in your graveyard.

Snow-Covered Mountain

Symbiotic Wurm

When this creature dies, create seven 1/1 green Insect creature tokens.

Ravenous Lindwurm

When this creature enters, you gain 4 life.

Charnelhoard Wurm

Trample
Whenever this creature deals damage to an opponent, you may return target card from your graveyard to your hand.

Worldspine Wurm

Trample
When this creature dies, create three 5/5 green Wurm creature tokens with trample.
When Worldspine Wurm is put into a graveyard from anywhere, shuffle it into its owner's library.

Massacre Wurm

When this creature enters, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, that player loses 2 life.

Shivan Wurm

Trample
When this creature enters, return a red or green creature you control to its owner's hand.

Yavimaya Wurm

Plated Slagwurm

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Bookwurm

Trample
When this creature enters, you gain 3 life and draw a card.
{2}{G}: Put this card from your graveyard into your library third from the top.

Wurmcoil Engine

Deathtouch, lifelink
When this creature dies, create a 3/3 colorless Phyrexian Wurm artifact creature token with deathtouch and a 3/3 colorless Phyrexian Wurm artifact creature token with lifelink.

Snow-Covered Plains

Pelakka Wurm

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
When this creature enters, you gain 7 life.
When this creature dies, draw a card.

Impervious Greatwurm

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Indestructible

Armada Wurm

Trample
When this creature enters, create a 5/5 green Wurm creature token with trample.

Engulfing Slagwurm

Whenever this creature blocks or becomes blocked by a creature, destroy that creature. You gain life equal to that creature's toughness.

Bramble Wurm

Reach, trample
When this creature enters, you gain 5 life.
{2}{G}, Exile this card from your graveyard: You gain 5 life.

Pouncing Wurm

Kicker {2}{G} (You may pay an additional {2}{G} as you cast this spell.)
If this creature was kicked, it enters with three +1/+1 counters on it and with haste.

Replicating Ring

{T}: Add one mana of any color.
At the beginning of your upkeep, put a night counter on this artifact. Then if it has eight or more night counters on it, remove all of them and create eight colorless snow artifact tokens named Replicated Ring with "{T}: Add one mana of any color."