Pyroblast

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

Raze

As an additional cost to cast this spell, sacrifice a land.
Destroy target land.

Mox Ruby

Mountain

Squee's Embrace

Enchant creature
Enchanted creature gets +2/+2.
When enchanted creature dies, return that card to its owner's hand.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Awaken the Ancient

Enchant Mountain
Enchanted Mountain is a 7/7 red Giant creature with haste. It's still a land.

Chained to the Rocks

Enchant Mountain you control
When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield. (That creature returns under its owner's control.)

Mox Pearl

Granite Grip

Enchant creature
Enchanted creature gets +1/+0 for each Mountain you control.

Magma Jet

Magma Jet deals 2 damage to any target. Scry 2.

Black Lotus

{T}, Sacrifice this artifact: Add three mana of any one color.

Browbeat

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

Strip Mine

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice this creature.

Squee, the Immortal

You may cast this card from your graveyard or from exile.

Lava Dart

Lava Dart deals 1 damage to any target.
Flashback—Sacrifice a Mountain. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Crucible of Worlds

Blood Moon

Chaos Moon

At the beginning of each upkeep, count the number of permanents. If the number is odd, until end of turn, red creatures get +1/+1 and whenever a player taps a Mountain for mana, that player adds an additional {R}. If the number is even, until end of turn, red creatures get -1/-1 and if a player taps a Mountain for mana, that Mountain produces colorless mana instead of any other type.

Molten Rain

Destroy target land. If that land was nonbasic, Molten Rain deals 2 damage to the land's controller.

Sol Ring

Koth of the Hammer

+1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land.
−2: Add {R} for each Mountain you control.
−5: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"