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 source.)

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.

, : Tap target creature. This ability costs less to activate during your turn.

, Sacrifice Hylda's Crown of Winter: Draw a card for each tapped creature your opponents control.

, Sacrifice Neverwinter Dryad: Search your library for a basic Forest card, put it onto the battlefield tapped, then shuffle.

Flying, vigilance

Whenever a Dragon you control attacks, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's next untap step.

Whenever Queen of Ice deals combat damage to a creature, tap that creature. It doesn't untap during its controller's next untap step.

: Untap target snow land.

Gust of Wind — When Winter Eladrin enters the battlefield, return up to one other target creature to its owner's hand.

Flip a coin. If you win the flip, Winter Sky deals 1 damage to each creature and each player. If you lose the flip, each player draws a card.

Wintermoon Mesa enters the battlefield tapped.

: Add .

, , Sacrifice Wintermoon Mesa: Tap two target lands.

Cast this spell only during combat before blockers are declared.

X can't be greater than the number of snow lands you control.

Choose X target attacking creatures. For each of those creatures, its controller may pay or . If that player doesn't, destroy that creature at end of combat. If that player pays only , prevent all combat damage that would be dealt to and dealt by that creature this combat.

Whenever a player taps a snow land for mana, that player adds one mana of any type that land produced. That land doesn't untap during its controller's next untap step.

Put a +1/+1 counter on up to one target creature you control. Tap up to one target creature you don't control, and that creature doesn't untap during its controller's next untap step.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)