Coal Stoker

When this creature enters, if you cast it from your hand, add {R}{R}{R}.

Taste for Mayhem

Enchant creature
Enchanted creature gets +2/+0.
Hellbent — Enchanted creature gets an additional +2/+0 as long as you have no cards in hand.

Mountain

Caterwauling Boggart

Goblins you control and Elementals you control have menace. (They can't be blocked except by two or more creatures.)

Cone of Flame

Cone of Flame deals 1 damage to any target, 2 damage to another target, and 3 damage to a third target.

Furnace Whelp

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

Flowstone Hellion

Haste
{0}: This creature gets +1/-1 until end of turn.

Cackling Flames

Cackling Flames deals 3 damage to any target.
Hellbent — Cackling Flames deals 5 damage instead if you have no cards in hand.

Shivan Dragon

Seismic Strike

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

Torrent of Stone

Torrent of Stone deals 4 damage to target creature.
Splice onto Arcane—Sacrifice two Mountains. (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Staff of the Flame Magus

Whenever you cast a red spell or a Mountain you control enters, you gain 1 life.

Runed Stalactite

Equipped creature gets +1/+1 and is every creature type.
Equip {2}

Lightning Strike

Lightning Strike deals 3 damage to any target.

Mudbrawler Cohort

Haste
This creature gets +1/+1 as long as you control another red creature.

Hematite Golem

{1}{R}: This creature gets +2/+0 until end of turn.

Rummaging Goblin

Fire-Belly Changeling

Changeling (This card is every creature type.)
{R}: This creature gets +1/+0 until end of turn. Activate no more than twice each turn.

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Arc Lightning

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.

Rakdos Carnarium

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {B}{R}.

Hostile Realm

Enchant land
Enchanted land has "{T}: Target creature can't block this turn."

Myr Enforcer

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

Thundering Giant

Haste (This creature can attack and {T} as soon as it comes under your control.)

Goblin Roughrider

Cathodion

Bogardan Rager

Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, target creature gets +4/+0 until end of turn.

Paragon of Fierce Defiance

Other red creatures you control get +1/+1.
{R}, {T}: Another target red creature you control gains haste until end of turn. (It can attack and {T} this turn.)

Borderland Marauder

Whenever this creature attacks, it gets +2/+0 until end of turn.

Foundry Street Denizen

Whenever another red creature you control enters, this creature gets +1/+0 until end of turn.