Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Snow-Covered Forest

Rimewood Falls

({T}: Add {G} or {U}.)
Rimewood Falls enters tapped.

Hydroblast

Choose one —
• Counter target spell if it's red.
• Destroy target permanent if it's red.

Shimmerdrift Vale

Shimmerdrift Vale enters tapped.
As Shimmerdrift Vale enters, choose a color.
{T}: Add one mana of the chosen color.

Thought Scour

Target player mills two cards.
Draw a card.

Cast into the Fire

Choose one —
• Cast into the Fire deals 1 damage to each of up to two target creatures.
• Exile target artifact.

Volatile Fjord

({T}: Add {U} or {R}.)
Volatile Fjord enters tapped.

Tome Scour

Rime Tender

{T}: Untap another target snow permanent.

Venture Deeper

Target player mills four cards. (Then exile this card. You may cast the creature later from exile.)

Merfolk Secretkeeper

Merfolk Secretkeeper // Venture Deeper

Snow-Covered Island

Iceberg Cancrix

Whenever another snow permanent you control enters, you may have target player mill two cards.

Lórien Revealed

Draw three cards.
Islandcycling {1} ({1}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)

Snow-Covered Mountain

Winter's Rest

Enchant creature
When Winter's Rest enters, tap enchanted creature.
As long as you control another snow permanent, enchanted creature doesn't untap during its controller's untap step.

Into the North

Search your library for a snow land card, put it onto the battlefield tapped, then shuffle.

Highland Forest

({T}: Add {R} or {G}.)
Highland Forest enters tapped.

Breath Weapon

Breath Weapon deals 2 damage to each non-Dragon creature.

Relic of Progenitus

{T}: Target player exiles a card from their graveyard.
{1}, Exile Relic of Progenitus: Exile all graveyards. Draw a card.

Frost Bite

Frost Bite deals 2 damage to target creature or planeswalker. If you control three or more snow permanents, it deals 3 damage instead.

Moment's Peace

Prevent all combat damage that would be dealt this turn.
Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Pyroblast

Choose one —
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.

Skred

Skred deals damage to target creature equal to the number of snow permanents you control.