Frostwalla

{S}: Frostwalla gets +2/+2 until end of turn. Activate only once each turn. ({S} can be paid with one mana from a snow source.)

Obsessive Search

Draw a card.
Madness {U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Leap

Target creature gains flying until end of turn.
Draw a card.

Icehide Troll

{S}{S}: Icehide Troll gets +2/+0 and gains indestructible until end of turn. Tap it. (Damage and effects that say "destroy" don't destroy it. {S} can be paid with one mana from a snow source.)

Into the North

Search your library for a snow land card, put it onto the battlefield tapped, then shuffle.

Shadow Rift

Target creature gains shadow until end of turn. (It can block or be blocked by only creatures with shadow.)
Draw a card.

Explore

You may play an additional land this turn.
Draw a card.

Highland Forest

({T}: Add {R} or {G}.)
Highland Forest enters tapped.

Rime Tender

{T}: Untap another target snow permanent.

Fatigue

Target player skips their next draw step.

Prizefight

Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)
Create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Priest of the Haunted Edge

{T}, Sacrifice Priest of the Haunted Edge: Target creature gets -X/-X until end of turn, where X is the number of snow lands you control. Activate only as a sorcery.

Snow Devil

Enchant creature
Enchanted creature has flying.
Enchanted creature has first strike as long as it's blocking and you control a snow land.

Woodland Chasm

({T}: Add {B} or {G}.)
Woodland Chasm enters tapped.

Monstrous Growth

Target creature gets +4/+4 until end of turn.

Snow-Covered Island

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Shimmerdrift Vale

Shimmerdrift Vale enters tapped.
As Shimmerdrift Vale enters, choose a color.
{T}: Add one mana of the chosen color.

Berg Strider

When Berg Strider enters, tap target artifact or creature an opponent controls. If {S} was spent to cast this spell, that permanent doesn't untap during its controller's next untap step. ({S} is mana from a snow source.)

Bioshift

Move any number of +1/+1 counters from target creature onto another target creature with the same controller.

Woolly Mammoths

Woolly Mammoths has trample as long as you control a snow land.

Pilfering Hawk

Flying
{S}, {T}: Draw a card, then discard a card. ({S} can be paid with one mana from a snow source.)

Rimebound Dead

{S}: Regenerate Rimebound Dead. ({S} can be paid with one mana from a snow source.)

Misstep

Creatures target player controls don't untap during that player's next untap step.

Snow-Covered Forest

Counterspell

Snow-Covered Swamp

Sculptor of Winter

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Karplusan Wolverine

Whenever Karplusan Wolverine becomes blocked, you may have it deal 1 damage to any target.

Gangrenous Zombies

{T}, Sacrifice Gangrenous Zombies: Gangrenous Zombies deals 1 damage to each creature and each player. If you control a snow Swamp, Gangrenous Zombies deals 2 damage to each creature and each player instead.

Fruition

You gain 1 life for each Forest on the battlefield.

Giant Growth

Target creature gets +3/+3 until end of turn.

Sorcerous Sight

Look at target opponent's hand.
Draw a card.

Sulfurous Mire

({T}: Add {B} or {R}.)
Sulfurous Mire enters tapped.

Groundswell

Target creature gets +2/+2 until end of turn.
Landfall — If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead.

Whiteout

All creatures lose flying until end of turn.
Sacrifice a snow land: Return Whiteout from your graveyard to your hand.

Rimewood Falls

({T}: Add {G} or {U}.)
Rimewood Falls enters tapped.

Thought Scour

Target player mills two cards.
Draw a card.

Winter's Rest

Enchant creature
When Winter's Rest enters, tap enchanted creature.
As long as you control another snow permanent, enchanted creature doesn't untap during its controller's untap step.

Ice Tunnel

({T}: Add {U} or {B}.)
Ice Tunnel enters tapped.

Frost Bite

Frost Bite deals 2 damage to target creature or planeswalker. If you control three or more snow permanents, it deals 3 damage instead.

Larger Than Life

Target creature gets +4/+4 and gains trample until end of turn.

Mobilize

Gigadrowse

Replicate {U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)
Tap target permanent.

Hydroform

Target land becomes a 3/3 Elemental creature with flying until end of turn. It's still a land.

Gutless Ghoul

{1}, Sacrifice a creature: You gain 2 life.

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Chilling Shade

Flying
{S}: Chilling Shade gets +1/+1 until end of turn. ({S} can be paid with one mana from a snow source.)

Dispel

Growth Spiral

Draw a card. You may put a land card from your hand onto the battlefield.

Skred

Skred deals damage to target creature equal to the number of snow permanents you control.

Volatile Fjord

({T}: Add {U} or {R}.)
Volatile Fjord enters tapped.

Mutant's Prey

Target creature you control with a +1/+1 counter on it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Prevent all combat damage that would be dealt this turn.

Iceberg Cancrix

Whenever another snow permanent you control enters, you may have target player mill two cards.

Stream of Thought

Target player mills four cards. You shuffle up to four cards from your graveyard into your library.
Replicate {2}{U}{U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Boreal Centaur

{S}: Boreal Centaur gets +1/+1 until end of turn. Activate only once each turn. ({S} can be paid with one mana from a snow source.)

Grim Draugr

{1}{S}: Grim Draugr gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures. {S} can be paid with one mana from a snow source.)