Wildfire Elemental

Whenever an opponent is dealt noncombat damage, creatures you control get +1/+0 until end of turn.

Chandra's Pyreling

Whenever a source you control deals noncombat damage to an opponent, Chandra's Pyreling gets +1/+0 and gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Mountain

Ogre Battlecaster

First strike
Whenever Ogre Battlecaster attacks, you may cast target instant or sorcery card from your graveyard by paying {R}{R} in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, Ogre Battlecaster gets +X/+0 until end of turn, where X is that spell's mana value.

Chandra's Spitfire

Flying
Whenever an opponent is dealt noncombat damage, Chandra's Spitfire gets +3/+0 until end of turn.

Thrill of Possibility

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

Hungry Flames

Hungry Flames deals 3 damage to target creature and 2 damage to target player or planeswalker.

Fiery Intervention

Choose one —
• Fiery Intervention deals 5 damage to target creature.
• Destroy target artifact.

Flame Lash

Coalborn Entity

{2}{R}: Coalborn Entity deals 1 damage to target creature token, player, or planeswalker.

Dance with Devils

Create two 1/1 red Devil creature tokens. They have "When this creature dies, it deals 1 damage to any target."

Pillar of Flame

Pillar of Flame deals 2 damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Thermo-Alchemist

Defender
{T}: Thermo-Alchemist deals 1 damage to each opponent.
Whenever you cast an instant or sorcery spell, untap Thermo-Alchemist.

Thriving Bluff

Thriving Bluff enters tapped. As it enters, choose a color other than red.
{T}: Add {R} or one mana of the chosen color.