Spawn of Thraxes

Flying
When this creature enters, it deals damage to any target equal to the number of Mountains you control.

Dragon Fodder

Create two 1/1 red Goblin creature tokens.

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Chandra Nalaar

+1: Chandra Nalaar deals 1 damage to target player or planeswalker.
−X: Chandra Nalaar deals X damage to target creature.
−8: Chandra Nalaar deals 10 damage to target player or planeswalker and each creature that player or that planeswalker's controller controls.

Mountain

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Drakuseth, Maw of Flames

Flying
Whenever Drakuseth attacks, it deals 4 damage to any target and 3 damage to each of up to two other targets.

Trumpet Blast

Attacking creatures get +2/+0 until end of turn.

Iron Myr

Awaken the Ancient

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

Rage Reflection

Creatures you control have double strike.

Rorix Bladewing

Count on Luck

At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.

Insurrection

Untap all creatures and gain control of them until end of turn. They gain haste until end of turn.

Urabrask the Hidden

Creatures you control have haste.
Creatures your opponents control enter tapped.

Threaten

Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn. (It can attack and {T} this turn.)

Flame Slash

Flame Slash deals 4 damage to target creature.

Thrill of Possibility

As an additional cost to cast this spell, discard a card.
Draw two cards.

Ashnod's Altar

Boltwave

Boltwave deals 3 damage to each opponent.

Reverberate

Copy target instant or sorcery spell. You may choose new targets for the copy.

Seething Song

Goblin Bombardment

Sacrifice a creature: This enchantment deals 1 damage to any target.

Cathartic Reunion

As an additional cost to cast this spell, discard two cards.
Draw three cards.

Hordeling Outburst

Create three 1/1 red Goblin creature tokens.

Rakka Mar

Haste
{R}, {T}: Create a 3/1 red Elemental creature token with haste.

Moonveil Dragon

Flying
{R}: Each creature you control gets +1/+0 until end of turn.