Flying, vigilance

: When target creature other than Adarkar Valkyrie dies this turn, return that card to the battlefield under your control.

When Alpine Guide enters the battlefield, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle your library.

Alpine Guide attacks each combat if able.

When Alpine Guide leaves the battlefield, sacrifice a Mountain.

( can be paid with one mana from a snow permanent.)

When Arcum's Astrolabe enters the battlefield, draw a card.

, : Add one mana of any color.

Flash

Flying

When Blizzard Strix enters the battlefield, if you control another snow permanent, exile target permanent other than Blizzard Strix. Return that card to the battlefield under its owner's control at the beginning of the next end step.

: Add .

Boreal Shelf enters the battlefield tapped.

: Add or .

: Monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous. can be paid with one mana from a snow permanent.)

As long as Chillerpillar is monstrous, it has flying.

Coldsteel Heart enters the battlefield tapped.

As Coldsteel Heart enters the battlefield, choose a color.

: Add one mana of the chosen color.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. can be paid with one mana from a snow permanent.)

If a creature would deal combat damage to you and/or one or more creatures you control, prevent X of that damage, where X is the number of age counters on Cover of Winter.

: Put an age counter on Cover of Winter.

Frost Marsh enters the battlefield tapped.

: Add or .

: Add .

: Until end of turn, Frostwalk Bastion becomes a 2/3 Construct artifact creature. It's still a land. ( can be paid with one mana from a snow permanent.)

Whenever Frostwalk Bastion deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

Reach (This creature can block creatures with flying.)

Whenever Frostweb Spider blocks a creature with flying, put a +1/+1 counter on Frostweb Spider at end of combat.

Enchant creature

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. can be paid with one mana from a snow permanent.)

Enchanted creature gets +3/+3 for each age counter on Glacial Plating.

, Sacrifice a creature: You gain 2 life.

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

( can be paid with one mana from a snow permanent.)

Whenever Marit Lage's Slumber or another snow permanent enters the battlefield under your control, scry 1.

At the beginning of your upkeep, if you control ten or more snow permanents, sacrifice Marit Lage's Slumber. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

Whenever Ohran Viper deals combat damage to a creature, destroy that creature at end of combat.

Whenever Ohran Viper deals combat damage to a player, you may draw a card.

Enchant snow land you control

When On Thin Ice enters the battlefield, exile target creature an opponent controls until On Thin Ice leaves the battlefield.

Phyrexian Snowcrusher attacks each combat if able.

: Phyrexian Snowcrusher gets +1/+0 until end of turn. ( can be paid with one mana from a snow permanent.)

: Untap another target snow permanent.

: Regenerate Rimebound Dead. ( can be paid with one mana from a snow permanent.)

Trample

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

: Target creature blocks target creature this turn if able. ( can be paid with one mana from a snow permanent.)

Ronom Serpent can't attack unless defending player controls a snow land.

When you control no snow lands, sacrifice Ronom Serpent.

: Add .

, : Look at the top card of your library. If that card is snow, you may reveal it and put it into your hand. ( can be paid with one mana from a snow permanent.)

U

W

Flying

, : Tap target creature.

: Thermopod gains haste until end of turn. ( can be paid with one mana from a snow permanent.)

Sacrifice a creature: Add .

Defender, flying

Cumulative upkeep—An opponent gains 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Snow landwalk (This creature can't be blocked as long as defending player controls a snow land.)

: Regenerate Zombie Musher. ( can be paid with one mana from a snow permanent.)