Spawn of Thraxes

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

Boltwave

Boltwave deals 3 damage to each opponent.

Reverberate

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

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.

Rage Reflection

Creatures you control have double strike.

Rorix Bladewing

Ashnod's Altar

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Rakka Mar

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

Thrill of Possibility

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

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.

Moonveil Dragon

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

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Hordeling Outburst

Create three 1/1 red Goblin creature tokens.

Flame Slash

Flame Slash deals 4 damage to target creature.

Seething Song

Count on Luck

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

Trumpet Blast

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

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.

Awaken the Ancient

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

Mountain

Insurrection

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

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.)

Urabrask the Hidden

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