If X is 5 or more, this spell can't be countered and the damage can't be prevented.
{2}{R}{R}
Chain Reaction
Sorcery
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
{2}{R}{R}
Chandra's Outrage
Instant
Chandra's Outrage deals 4 damage to target creature and 2 damage to that creature's controller.
{1}{R}{R}
Chandra's Phoenix
Creature - Phoenix
Flying
Haste (This creature can attack and {T} as soon as it comes under your control.)
Whenever an opponent is dealt damage by a red instant or sorcery spell you control or by a red planeswalker you control, return Chandra's Phoenix from your graveyard to your hand.
2 /
2
{1}{R}{R}
Chandra, Fire of Kaladesh
Legendary Creature - Human Shaman
Whenever you cast a red spell, untap Chandra, Fire of Kaladesh.
{T}: Chandra, Fire of Kaladesh deals 1 damage to target player or planeswalker. If Chandra has dealt 3 or more damage this turn, exile her, then return her to the battlefield transformed under her owner's control.
2 /
2
--
Chandra, Roaring Flame
Legendary Planeswalker - Chandra
+1: Chandra, Roaring Flame deals 2 damage to target player or planeswalker.
-2: Chandra, Roaring Flame deals 2 damage to target creature.
-7: Chandra, Roaring Flame deals 6 damage to each opponent. Each player dealt damage this way gets an emblem with "At the beginning of your upkeep, this emblem deals 3 damage to you."
2 /
2
{3}{R}
Chandra, the Firebrand
Legendary Planeswalker - Chandra
+1: Chandra, the Firebrand deals 1 damage to any target.
-2: When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
-6: Chandra, the Firebrand deals 6 damage to each of up to six targets.
L:
3
{5}{R}
Charmbreaker Devils
Creature - Devil
At the beginning of your upkeep, return an instant or sorcery card at random from your graveyard to your hand.
Whenever you cast an instant or sorcery spell, Charmbreaker Devils gets +4/+0 until end of turn.
4 /
4
{1}{R}{R}
Collective Defiance
Sorcery
Escalate {1} (Pay this cost for each mode chosen beyond the first.)
Choose one or more --
• Target player discards all the cards in their hand, then draws that many cards.
• Collective Defiance deals 4 damage to target creature.
• Collective Defiance deals 3 damage to target opponent or planeswalker.
{X}{R}{R}
Comet Storm
Instant
Multikicker {1} (You may pay an additional {1} any number of times as you cast this spell.)
Choose any target, then choose another target for each time this spell was kicked. Comet Storm deals X damage to each of them.
{3}{R}{R}
Dictate of the Twin Gods
Enchantment
Flash
If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.
{R}{R}
Doublecast
Sorcery
When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
{1}{R}{R}
Dualcaster Mage
Creature - Human Wizard
Flash
When Dualcaster Mage enters the battlefield, copy target instant or sorcery spell. You may choose new targets for the copy.
2 /
2
{X}{R}{R}
Electrodominance
Instant
Electrodominance deals X damage to any target. You may cast a spell with mana value X or less from your hand without paying its mana cost.
{1}{R}
Electrostatic Field
Creature - Wall
Defender
Whenever you cast an instant or sorcery spell, Electrostatic Field deals 1 damage to each opponent.
0 /
4
{3}{R}{R}
Embermaw Hellion
Creature - 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.
4 /
5
{1}
Expedition Map
Artifact
{2}, {T}, Sacrifice Expedition Map: Search your library for a land card, reveal it, put it into your hand, then shuffle.
{1}{R}{R}
Exquisite Firecraft
Sorcery
Exquisite Firecraft deals 4 damage to any target.
Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, this spell can't be countered.
{X}{X}{R}
Fall of the Titans
Instant
Surge {X}{R} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)
Fall of the Titans deals X damage to each of up to two targets.
{2}{R}{R}
Fateful Showdown
Instant
Fateful Showdown deals damage to any target equal to the number of cards in your hand. Discard all the cards in your hand, then draw that many cards.
{R}
Fiery Impulse
Instant
Fiery Impulse deals 2 damage to target creature.
Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, Fiery Impulse deals 3 damage instead.
{3}{R}{R}
Fire Servant
Creature - Elemental
If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.
4 /
3
{3}{R}{R}
Galvanoth
Creature - Beast
At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell.
3 /
3
{3}{R}{R}
Glorybringer
Creature - Dragon
Flying, haste
You may exert Glorybringer as it attacks. When you do, it deals 4 damage to target non-Dragon creature an opponent controls. (An exerted creature won't untap during your next untap step.)
4 /
4
{1}{R}
Harsh Mentor
Creature - Human Cleric
Whenever an opponent activates an ability of an artifact, creature, or land on the battlefield, if it isn't a mana ability, Harsh Mentor deals 2 damage to that player.
2 /
2
{2}{R}
Hungry Flames
Instant
Hungry Flames deals 3 damage to target creature and 2 damage to target player or planeswalker.
{1}{R}
Incinerate
Instant
Incinerate deals 3 damage to any target. A creature dealt damage this way can't be regenerated this turn.
{R}{R}
Increasing Vengeance
Instant
Copy target instant or sorcery spell you control. If this spell was cast from a graveyard, copy that spell twice instead. You may choose new targets for the copies.
Flashback {3}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{4}{R}{R}
Inferno Titan
Creature - Giant
{R}: Inferno Titan gets +1/+0 until end of turn.
Whenever Inferno Titan enters the battlefield or attacks, it deals 3 damage divided as you choose among one, two, or three targets.
6 /
6
{X}{R}{R}
Jaya's Immolating Inferno
Legendary Sorcery
(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Jaya's Immolating Inferno deals X damage to each of up to three targets.
{1}{R}
Lava Coil
Sorcery
Lava Coil deals 4 damage to target creature. If that creature would die this turn, exile it instead.
{R}
Lava Spike
Sorcery - Arcane
Lava Spike deals 3 damage to target player or planeswalker.
{2}{R}
Light Up the Stage
Sorcery
Spectacle {R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
Exile the top two cards of your library. Until the end of your next turn, you may play those cards.
{R}
Lightning Bolt
Instant
Lightning Bolt deals 3 damage to any target.
{1}{R}
Lightning Strike
Instant
Lightning Strike deals 3 damage to any target.
{1}{R}
Magma Jet
Instant
Magma Jet deals 2 damage to any target. Scry 2.
{5}{R}{R}{R}
Magmatic Force
Creature - Elemental
At the beginning of each upkeep, Magmatic Force deals 3 damage to any target.
7 /
7
{5}
Mirari
Legendary Artifact
Whenever you cast an instant or sorcery spell, you may pay {3}. If you do, copy that spell. You may choose new targets for the copy.
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{R}{R}{R}
Obsidian Fireheart
Creature - Elemental
{1}{R}{R}: Put a blaze counter on target land without a blaze counter on it. For as long as that land has a blaze counter on it, it has "At the beginning of your upkeep, this land deals 1 damage to you." (The land continues to burn after Obsidian Fireheart has left the battlefield.)
4 /
4
{4}
Primal Amulet
Artifact
Instant and sorcery spells you cast cost {1} less to cast.
Whenever you cast an instant or sorcery spell, put a charge counter on Primal Amulet. Then if there are four or more charge counters on it, you may remove those counters and transform it.
--
Primal Wellspring
Land
(Transforms from Primal Amulet.)
{T}: Add one mana of any color. When that mana is spent to cast an instant or sorcery spell, copy that spell and you may choose new targets for the copy.
{1}{R}
Punishing Fire
Instant
Punishing Fire deals 2 damage to any target.
Whenever an opponent gains life, you may pay {R}. If you do, return Punishing Fire from your graveyard to your hand.
{5}
Pyromancer's Gauntlet
Artifact
If a red instant or sorcery spell you control or a red planeswalker you control would deal damage to a permanent or player, it deals that much damage plus 2 to that permanent or player instead.
{5}
Pyromancer's Goggles
Legendary Artifact
{T}: Add {R}. When that mana is spent to cast a red instant or sorcery spell, copy that spell and you may choose new targets for the copy.
{X}{R}{R}
Ravaging Blaze
Instant
Ravaging Blaze deals X damage to target creature.
Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, Ravaging Blaze also deals X damage to that creature's controller.
{R}{R}
Reverberate
Instant
Copy target instant or sorcery spell. You may choose new targets for the copy.
{2}{R}
Risk Factor
Instant
Target opponent may have Risk Factor deal 4 damage to them. If that player doesn't, you draw three cards.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)
{1}{R}
Runaway Steam-Kin
Creature - Elemental
Whenever you cast a red spell, if Runaway Steam-Kin has fewer than three +1/+1 counters on it, put a +1/+1 counter on Runaway Steam-Kin.
Remove three +1/+1 counters from Runaway Steam-Kin: Add {R}{R}{R}.
1 /
1
{1}{R}
Satyr Firedancer
Enchantment Creature - Satyr
Whenever an instant or sorcery spell you control deals damage to an opponent, Satyr Firedancer deals that much damage to target creature that player controls.
1 /
1
{1}{R}
Searing Spear
Instant
Searing Spear deals 3 damage to any target.
{2}{R}
Seething Song
Instant
Add {R}{R}{R}{R}{R}.
{R}
Shock
Instant
Shock deals 2 damage to any target.
{2}{R}
Skewer the Critics
Sorcery
Spectacle {R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
Skewer the Critics deals 3 damage to any target.
{1}{R}
Smash to Smithereens
Instant
Destroy target artifact. Smash to Smithereens deals 3 damage to that artifact's controller.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{1}{R}{R}
Sulfuric Vortex
Enchantment
At the beginning of each player's upkeep, Sulfuric Vortex deals 2 damage to that player.
If a player would gain life, that player gains no life instead.
{5}{R}
Sunbird's Invocation
Enchantment
Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order.
{2}
Thaumatic Compass
Artifact
{3}, {T}: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
At the beginning of your end step, if you control seven or more lands, transform Thaumatic Compass.
--
Spires of Orazca
Land
(Transforms from Thaumatic Compass.)
{T}: Add {C}.
{T}: Untap target attacking creature an opponent controls and remove it from combat.
{1}{R}
The Flame of Keld
Enchantment - Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I -- Discard your hand.
II -- Draw two cards.
III -- If a red source you control would deal damage to a permanent or player this turn, it deals that much damage plus 2 to that permanent or player instead.
{3}{R}
Vance's Blasting Cannons
Legendary Enchantment
At the beginning of your upkeep, exile the top card of your library. If it's a nonland card, you may cast that card this turn.
Whenever you cast your third spell in a turn, you may transform Vance's Blasting Cannons.
--
Spitfire Bastion
Legendary Land
(Transforms from Vance's Blasting Cannons.)
{T}: Add {R}.
{2}{R}, {T}: Spitfire Bastion deals 3 damage to any target.
{4}{R}
Volcanic Offering
Instant
Destroy target nonbasic land you don't control and target nonbasic land of an opponent's choice you don't control.
Volcanic Offering deals 7 damage to target creature you don't control and 7 damage to target creature of an opponent's choice you don't control.
{2}{R}
Volt Charge
Instant
Volt Charge deals 3 damage to any target. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
{2}{R}{R}
Wild Ricochet
Instant
You may choose new targets for target instant or sorcery spell. Then copy that spell. You may choose new targets for the copy.
{1}{R}
Young Pyromancer
Creature - Human Shaman
Whenever you cast an instant or sorcery spell, create a 1/1 red Elemental creature token.