FlyingRimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield.: Put an ice counter on target permanent.Permanents with ice counters on them are snow.
TrampleCumulative upkeep or (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.)When Arctic Nishoba dies, you gain 2 life for each age counter on it.
Woolly Razorback enters with three ice counters on it.As long as Woolly Razorback has an ice counter on it, prevent all combat damage it would deal and it has defender.Whenever Woolly Razorback blocks, remove an ice counter from it.
TrampleCumulative upkeep—Put a +1/+1 counter on a creature an opponent controls. (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.)
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.)Whenever you pay Hibernation's End's cumulative upkeep, you may search your library for a creature card with mana value equal to the number of age counters on Hibernation's End, put it onto...
You may cast Haakon, Stromgald Scourge from your graveyard, but not from anywhere else.As long as Haakon is on the battlefield, you may cast Knight spells from your graveyard.When Haakon dies, you lose 2 life.
Cumulative upkeep or (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.)When Jötun Owl Keeper dies, create a 1/1 white Bird creature token with flying for each age counter on it.
Ursine Fylgja enters with four healing counters on it.Remove a healing counter from Ursine Fylgja: Prevent the next 1 damage that would be dealt to Ursine Fylgja this turn.: Put a healing counter on Ursine Fylgja.
TrampleWhenever 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 source.)