Coldsnap

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

Flying, indestructible

Flying {2}{S}: Tap target creature and put an ice counter on it. ({S} can be paid with one mana from a snow permanent.) Creatures with ice counters...

Each creature that's a Barbarian, a Warrior, or a Berserker gets +2/+2 and has haste.

Trample, haste Lightning Serpent enters the battlefield with X +1/+0 counters on it. At the beginning of the end step, sacrifice Lightning Serpent.

Flying Cumulative upkeep—Gain control of a land you don't control. (At the beginning of your upkeep, put an age counter on this permanent, then sac...

Other Soldier creatures get +1/+1 and have first strike. (They deal combat damage before creatures without first strike.)

Whenever you're dealt damage, you may create that many 1/1 white Soldier creature tokens.

{2}, {T}: Return target permanent to its owner's hand. Activate this ability only if you control four or more snow permanents.

{T}: Target artifact creature's controller sacrifices it. That player may search their library for a noncreature artifact card, put it onto the bat...

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

Cumulative upkeep—Sacrifice a creature. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay it...

Flying Whenever Zur the Enchanter attacks, you may search your library for an enchantment card with converted mana cost 3 or less and put it onto t...

Whenever a noncreature source you control deals damage, you gain that much life.

Trample While you're searching your library, you may cast Panglacial Wurm from your library.

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