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

{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.)

{T}: Add {C}.

{T}: Add {C}.

Flying {S}: Boreal Griffin gains first strike until end of turn. ({S} can be paid with one mana from a snow permanent.)

Flying {S}: Boreal Griffin gains first strike until end of turn. ({S} can be paid with one mana from a snow source.)

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

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

Cumulative upkeep—Add {R}. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost...

Cumulative upkeep—Add {R}. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost...

At the beginning of each end step, each player gains control of all nontoken permanents they own.

At the beginning of each end step, each player gains control of all nontoken permanents they own.

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

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

Destroy target nonsnow creature.

Destroy target nonsnow creature.

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

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

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

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

You may exile two blue cards from your hand rather than pay this spell's mana cost. Gain control of target noncreature spell. You may choose new ta...

You may exile two blue cards from your hand rather than pay this spell's mana cost. Gain control of target noncreature spell. You may choose new t...

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 ...

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 ...