Coldsnap

Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the...

Counter target spell. Recover {2}{U}{U} (When a creature is put into your graveyard from the battlefield, you may pay {2}{U}{U}. If you do, return ...

{U}, {T}: Target snow land becomes a 2/2 blue Elemental creature with flying. It's still a land.

Flying {1}{S}: Target creature loses flying until end of turn. ({S} can be paid with one mana from a snow source.)

Protection from black {W}: White Shield Crusader gains flying until end of turn. {W}{W}: White Shield Crusader gets +1/+0 until end of turn.

Ursine Fylgja enters the battlefield with four healing counters on it. Remove a healing counter from Ursine Fylgja: Prevent the next 1 damage that ...

Defender, flying Cumulative upkeep—An opponent gains 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice...

Tresserhorn Sinks enters the battlefield tapped. {T}: Add {B} or {R}.

{T}: Add {C}. {4}{S}, {T}, Sacrifice Mouth of Ronom: It deals 4 damage to target creature. ({S} can be paid with one mana from a snow source.)

Highland Weald enters the battlefield tapped. {T}: Add {R} or {G}.

Frost Marsh enters the battlefield tapped. {T}: Add {U} or {B}.

Boreal Shelf enters the battlefield tapped. {T}: Add {W} or {U}.

Arctic Flats enters the battlefield tapped. {T}: Add {G} or {W}.

Phyrexian Snowcrusher attacks each combat if able. {1}{S}: Phyrexian Snowcrusher gets +1/+0 until end of turn. ({S} can be paid with one mana from ...

Prevent all damage that black sources and red sources would deal this turn.

Phyrexian Ironfoot doesn't untap during your untap step. {1}{S}: Untap Phyrexian Ironfoot. ({S} can be paid with one mana from a snow source.)

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.

Coldsteel Heart enters the battlefield tapped. As Coldsteel Heart enters the battlefield, choose a color. {T}: Add one mana of the chosen color.

Trample Wilderness Elemental's power is equal to the number of nonbasic lands your opponents control.

Exile target creature. You draw cards equal to that creature's power. At the beginning of your next upkeep, return that card to the battlefield und...

Whenever another creature enters the battlefield under your control, put a +1/+1 counter on that creature and a +1/+1 counter on Juniper Order Ranger.

{X}{X}{1}: Destroy target artifact or creature with mana value X.

Flying Whenever Blizzard Specter deals combat damage to a player, choose one — • That player returns a permanent they control to its owner's hand...

Reach (This creature can block creatures with flying.) {R}: Steam Spitter gets +1/+0 until end of turn.