If X is 5 or more, this spell can't be countered and the damage can't be prevented.
{X}{X}{R}
Bonfire of the Damned
Sorcery
Bonfire of the Damned deals X damage to target player or planeswalker and each creature that player or that planeswalker's controller controls.
Miracle {X}{R} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)
{2}{R}
Brimstone Mage
Creature - Human Shaman
Level up {3}{R} ({3}{R}: Put a level counter on this. Level up only as a sorcery.)
LEVEL 1-2
2/3
{T}: Brimstone Mage deals 1 damage to any target.
LEVEL 3+
2/4
{T}: Brimstone Mage deals 3 damage to any target.
2 /
2
{R}
Burst Lightning
Instant
Kicker {4} (You may pay an additional {4} as you cast this spell.)
Burst Lightning deals 2 damage to any target. If this spell was kicked, it deals 4 damage instead.
--
Caldera Lake
Land
Caldera Lake enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {U} or {R}. Caldera Lake deals 1 damage to you.
{2}{R}
Char
Instant
Char deals 4 damage to any target and 2 damage to you.
{2}{R}
Cinder Pyromancer
Creature - Elemental Shaman
{T}: Cinder Pyromancer deals 1 damage to target player or planeswalker.
Whenever you cast a red spell, you may untap Cinder Pyromancer.
0 /
1
{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.
--
Command Tower
Land
{T}: Add one mana of any color in your commander's color identity.
{2}{R}
Cunning Sparkmage
Creature - Human Shaman
Haste
{T}: Cunning Sparkmage deals 1 damage to any target.
0 /
1
{1}{U}{R}
Electrolyze
Instant
Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.
--
Faerie Conclave
Land
Faerie Conclave enters the battlefield tapped.
{T}: Add {U}.
{1}{U}: Faerie Conclave becomes a 2/1 blue Faerie creature with flying until end of turn. It's still a land.
{1}{R}{ // }{1}{U}
Fire // Ice
Instant // Instant
Fire deals 2 damage divided as you choose among one or two targets.
Tap target permanent.
Draw a card.
{1}{R}
Fireslinger
Creature - Human Wizard
{T}: Fireslinger deals 1 damage to any target and 1 damage to you.
1 /
1
{1}{U}{R}
Gelectrode
Creature - Weird
{T}: Gelectrode deals 1 damage to any target.
Whenever you cast an instant or sorcery spell, you may untap Gelectrode.
0 /
1
--
Ghitu Encampment
Land
Ghitu Encampment enters the battlefield tapped.
{T}: Add {R}.
{1}{R}: Ghitu Encampment becomes a 2/1 red Warrior creature with first strike until end of turn. It's still a land. (It deals combat damage before creatures without first strike.)
--
Halimar Depths
Land
Halimar Depths enters tapped.
When Halimar Depths enters, look at the top three cards of your library, then put them back in any order.
{T}: Add {U}.
{X}{U}{U}{R}
Invoke the Firemind
Sorcery
Choose one --
• Draw X cards.
• Invoke the Firemind deals X damage to any target.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Izzet Boilerworks
Land
Izzet Boilerworks enters tapped.
When Izzet Boilerworks enters, return a land you control to its owner's hand.
{T}: Add {U}{R}.
--
Izzet Guildgate
Land - Gate
Izzet Guildgate enters the battlefield tapped.
{T}: Add {U} or {R}.
{U/R}{U/R}
Izzet Guildmage
Creature - Human Wizard
({U/R} can be paid with either {U} or {R}.)
{2}{U}: Copy target instant spell you control with mana value 2 or less. You may choose new targets for the copy.
{2}{R}: Copy target sorcery spell you control with mana value 2 or less. You may choose new targets for the copy.
2 /
2
{1}{U}{R}
Izzet Staticaster
Creature - Human Wizard
Flash (You may cast this spell any time you could cast an instant.)
Haste
{T}: Izzet Staticaster deals 1 damage to target creature and each other creature with the same name as that creature.
0 /
3
{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.
{1}{R}
Mizzium Mortars
Sorcery
Mizzium Mortars deals 4 damage to target creature you don't control.
Overload {3}{R}{R}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{U}{R}
Nin, the Pain Artist
Legendary Creature - Vedalken Wizard
{X}{U}{R}, {T}: Nin, the Pain Artist deals X damage to target creature. That creature's controller draws X cards.
1 /
1
{U}{R}
Nivix Guildmage
Creature - Human Wizard
{1}{U}{R}: Draw a card, then discard a card.
{2}{U}{R}: Copy target instant or sorcery spell you control. You may choose new targets for the copy.
2 /
2
--
Nivix, Aerie of the Firemind
Land
{T}: Add {C}.
{2}{U}{R}, {T}: Exile the top card of your library. Until your next turn, you may cast it if it's an instant or sorcery spell.
{2}{R}
Prodigal Pyromancer
Creature - Human Wizard
{T}: Prodigal Pyromancer deals 1 damage to any target.
1 /
1
{2}{U}
Prodigal Sorcerer
Creature - Human Wizard
{T}: Prodigal Sorcerer deals 1 damage to any target.
1 /
1
{2}{U}
Psionic Blast
Instant
Psionic Blast deals 4 damage to any target and 2 damage to you.
{U}{R}
Razorfin Hunter
Creature - Merfolk Goblin
{T}: Razorfin Hunter deals 1 damage to any target.
1 /
1
{R}{R}
Reverberate
Instant
Copy target instant or sorcery spell. You may choose new targets for the copy.
{1}{R}
Searing Spear
Instant
Searing Spear deals 3 damage to any target.
--
Shivan Reef
Land
{T}: Add {C}.
{T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.
{R}
Shock
Instant
Shock deals 2 damage to any target.
--
Steam Vents
Land - Island Mountain
({T}: Add {U} or {R}.)
As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.
--
Sulfur Falls
Land
Sulfur Falls enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.
--
Swiftwater Cliffs
Land
Swiftwater Cliffs enters tapped.
When Swiftwater Cliffs enters, you gain 1 life.
{T}: Add {U} or {R}.
--
Tectonic Edge
Land
{T}: Add {C}.
{1}, {T}, Sacrifice Tectonic Edge: Destroy target nonbasic land. Activate only if an opponent controls four or more lands.
--
Temple of Epiphany
Land
Temple of Epiphany enters tapped.
When Temple of Epiphany enters, scry 1.
{T}: Add {U} or {R}.
{U}{U}
Twincast
Instant
Copy target instant or sorcery spell. You may choose new targets for the copy.
{2}{R}
Vithian Stinger
Creature - Human Shaman
{T}: Vithian Stinger deals 1 damage to any target.
Unearth {1}{R} ({1}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
0 /
1
{1}{R}{R}
Vulshok Sorcerer
Creature - Human Shaman
Haste
{T}: Vulshok Sorcerer deals 1 damage to any target.
1 /
1
{1}{U}{R}
Winterflame
Instant
Choose one or both --
• Tap target creature.
• Winterflame deals 2 damage to target creature.
{1}{R}{R}
Anger of the Gods
Sorcery
Anger of the Gods deals 3 damage to each creature. If a creature dealt damage this way would die this turn, exile it instead.
{2}{R}
Chaos Warp
Instant
The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.
{U}{U}{R}
Counterflux
Instant
This spell can't be countered.
Counter target spell you don't control.
Overload {1}{U}{U}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")
{1}{U}
Cyclonic Rift
Instant
Return target nonland permanent you don't control to its owner's hand.
Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
{X}{R}
Demonfire
Sorcery
Demonfire deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead.
Hellbent -- If you have no cards in hand, this spell can't be countered and the damage can't be prevented.
{X}{R}
Devil's Play
Sorcery
Devil's Play deals X damage to any target.
Flashback {X}{R}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{1}{U}{U}
Polymorphist's Jest
Instant
Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.
{X}{R}
Red Sun's Zenith
Sorcery
Red Sun's Zenith deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead. Shuffle Red Sun's Zenith into its owner's library.
{X}{R}{R}
Starstorm
Instant
Starstorm deals X damage to each creature.
Cycling {3} ({3}, Discard this card: Draw a card.)
{R}
Vandalblast
Sorcery
Destroy target artifact you don't control.
Overload {4}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")