Dragon Egg

Defender
When this creature dies, create a 2/2 red Dragon creature token with flying and "{R}: This token gets +1/+0 until end of turn."

Thrill of Possibility

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

Heartfire Immolator

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{R}, Sacrifice this creature: It deals damage equal to its power to target creature or planeswalker.

Arcane Encyclopedia

Dismissive Pyromancer

{R}, {T}, Discard a card: Draw a card.
{2}{R}, {T}, Sacrifice this creature: It deals 4 damage to target creature.

Ancient Hellkite

Flying
{R}: This creature deals 1 damage to target creature defending player controls. Activate only if this creature is attacking.

Mountain

Diamond Knight

Vigilance (Attacking doesn't cause this creature to tap.)
As this creature enters, choose a color.
Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature.

Rapacious Dragon

Flying
When this creature enters, create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

Lightning Strike

Lightning Strike deals 3 damage to any target.

Demanding Dragon

Flying
When this creature enters, it deals 5 damage to target opponent unless that player sacrifices a creature of their choice.

Meteor Golem

When this creature enters, destroy target nonland permanent an opponent controls.

Kinetic Augur

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Kinetic Augur's power is equal to the number of instant and sorcery cards in your graveyard.
When this creature enters, discard up to two cards, then draw that many cards.

Soul Sear

Soul Sear deals 5 damage to target creature or planeswalker. That permanent loses indestructible until end of turn.

Immortal Phoenix

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature dies, return it to its owner's hand.

Ember Hauler

{1}, Sacrifice this creature: It deals 2 damage to any target.

Flameblast Dragon

Flying
Whenever this creature attacks, you may pay {X}{R}. If you do, it deals X damage to any target.

Shivan Dragon

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

Volcanic Dragon

Awaken the Ancient

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

Scorching Dragonfire

Scorching Dragonfire deals 3 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.

Spellgorger Weird

Whenever you cast a noncreature spell, put a +1/+1 counter on this creature.

Keldon Raider

When this creature enters, you may discard a card. If you do, draw a card.

Palladium Myr

Banefire

Banefire deals X damage to any target.
If X is 5 or more, this spell can't be countered and the damage can't be prevented.

Flame Sweep

Flame Sweep deals 2 damage to each creature except for creatures you control with flying.

Shock

Earth Servant

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

Pyroclastic Elemental

{1}{R}{R}: This creature deals 1 damage to target player.

Firewing Phoenix

Flying
{1}{R}{R}{R}: Return this card from your graveyard to your hand.

Fire Servant

If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.

Mazemind Tome

{T}, Put a page counter on this artifact: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{2}, {T}, Put a page counter on this artifact: Draw a card.
When there are four or more page counters on this artifact, exile it. If you do, you gain 4 life.

Guttersnipe

Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.

Embermaw Hellion

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
If another red source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead.

Bogardan Hellkite

Flash
Flying
When this creature enters, it deals 5 damage divided as you choose among any number of targets.