Target creature an opponent controls deals damage equal to its power to each other creature that player controls, then each of those creatures deals damage equal to its power to that creature.
{3}{R}
Anger
Creature - Incarnation
Haste
As long as Anger is in your graveyard and you control a Mountain, creatures you control have haste.
2 /
2
{8}{R}
Blasphemous Act
Sorcery
This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.
--
Buried Ruin
Land
{T}: Add {C}.
{2}, {T}, Sacrifice Buried Ruin: Return target artifact card from your graveyard to your hand.
{X}{R}
Burn from Within
Sorcery
Burn from Within deals X damage to any target. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.
{1}{R}
Cathartic Reunion
Sorcery
As an additional cost to cast this spell, discard two cards.
Draw three cards.
{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.
{1}{R}
Cinderclasm
Instant
Kicker {R} (You may pay an additional {R} as you cast this spell.)
Cinderclasm deals 1 damage to each creature. If it was kicked, it deals 2 damage to each creature instead.
{1}{R}
Circle of Flame
Enchantment
Whenever a creature without flying attacks you or a planeswalker you control, Circle of Flame deals 1 damage to that creature.
{3}
Commander's Sphere
Artifact
{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.
{2}{R}
Cunning Sparkmage
Creature - Human Shaman
Haste
{T}: Cunning Sparkmage deals 1 damage to any target.
0 /
1
{3}
Darksteel Plate
Artifact - Equipment
Indestructible
Equipped creature has indestructible.
Equip {2}
--
Detection Tower
Land
{T}: Add {C}.
{1}, {T}: Until end of turn, your opponents and creatures your opponents control with hexproof can be the targets of spells and abilities you control as though they didn't have hexproof.
{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.
{4}{R}{R}{R}
Drakuseth, Maw of Flames
Legendary Creature - Dragon
Flying
Whenever Drakuseth, Maw of Flames attacks, it deals 4 damage to any target and 3 damage to each of up to two other targets.
7 /
7
{R}
Faithless Looting
Sorcery
Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{3}{R}
Fanatic of Mogis
Creature - Minotaur Shaman
When Fanatic of Mogis enters the battlefield, it deals damage to each opponent equal to your devotion to red. (Each {R} in the mana costs of permanents you control counts toward your devotion to red.)
4 /
2
{3}{R}{R}{R}
Fiery Emancipation
Enchantment
If a source you control would deal damage to a permanent or player, it deals triple that damage to that permanent or player instead.
{X}{R}
Fireball
Sorcery
This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.
--
Forgotten Cave
Land
Forgotten Cave enters the battlefield tapped.
{T}: Add {R}.
Cycling {R} ({R}, Discard this card: Draw a card.)
{R}{R}{R}
Goblin Chainwhirler
Creature - Goblin Warrior
First strike
When Goblin Chainwhirler enters the battlefield, it deals 1 damage to each opponent and each creature and planeswalker they control.
3 /
3
--
Hanweir Battlements
Land
{T}: Add {C}.
{R}, {T}: Target creature gains haste until end of turn.
{3}{R}{R}, {T}: If you both own and control Hanweir Battlements and a creature named Hanweir Garrison, exile them, then meld them into Hanweir, the Writhing Township.
{2}{R}
Hanweir Garrison
Creature - Human Soldier
Whenever Hanweir Garrison attacks, create two 1/1 red Human creature tokens that are tapped and attacking.
(Melds with Hanweir Battlements.)
2 /
3
{4}
Hedron Archive
Artifact
{T}: Add {C}{C}.
{2}, {T}, Sacrifice Hedron Archive: Draw two cards.
{3}{R}{R}{R}
Hostility
Creature - Elemental Incarnation
Haste
If a spell you control would deal damage to an opponent, prevent that damage. Create a 3/1 red Elemental Shaman creature token with haste for each 1 damage prevented this way.
When Hostility is put into a graveyard from anywhere, shuffle it into its owner's library.
6 /
6
{2}
Howling Mine
Artifact
At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.
{1}{R}
Humble Defector
Creature - Human Rogue
{T}: Draw two cards. Target opponent gains control of Humble Defector. Activate only during your turn.
2 /
1
{2}
Iron Myr
Artifact Creature - Myr
{T}: Add {R}.
1 /
1
{R}
Magmatic Insight
Sorcery
As an additional cost to cast this spell, discard a land card.
Draw two cards.
{3}{R}
Manabarbs
Enchantment
Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.
{2}
Mind Stone
Artifact
{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.
{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}.)
--
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}.)
--
Myriad Landscape
Land
Myriad Landscape enters the battlefield tapped.
{T}: Add {C}.
{2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.
{3}{R}{R}
Neheb, the Eternal
Legendary Creature - Zombie Minotaur Warrior
Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)
At the beginning of your postcombat main phase, add {R} for each 1 life your opponents have lost this turn.
4 /
6
{3}
Orazca Relic
Artifact
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
{T}: Add {C}.
{T}, Sacrifice Orazca Relic: You gain 3 life and draw a card. Activate only if you have the city's blessing.
{4}
Otherworld Atlas
Artifact
{T}: Put a charge counter on Otherworld Atlas.
{T}: Each player draws a card for each charge counter on Otherworld Atlas.
{X}{R}
Purphoros's Intervention
Sorcery
Choose one --
• Create an X/1 red Elemental creature token with trample and haste. Sacrifice it at the beginning of the next end step.
• Purphoros's Intervention deals twice X damage to target creature or planeswalker.
{R}
Pyroblast
Instant
Choose one --
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.
{2}{R}{R}
Pyrohemia
Enchantment
At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pyrohemia.
{R}: Pyrohemia deals 1 damage to each creature and each player.
{R}
Quest for Pure Flame
Enchantment
Whenever a source you control deals damage to an opponent, you may put a quest counter on Quest for Pure Flame.
Remove four quest counters from Quest for Pure Flame and sacrifice it: If any source you control would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead.
{R}
Red Elemental Blast
Instant
Choose one --
• Counter target blue spell.
• Destroy target blue permanent.
{1}{R}{R}
Repercussion
Enchantment
Whenever a creature is dealt damage, Repercussion deals that much damage to that creature's controller.
{R}{R}
Reverberate
Instant
Copy target instant or sorcery spell. You may choose new targets for the copy.
{1}{R}
Roiling Vortex
Enchantment
At the beginning of each player's upkeep, Roiling Vortex deals 1 damage to them.
Whenever a player casts a spell, if no mana was spent to cast that spell, Roiling Vortex deals 5 damage to that player.
{R}: Your opponents can't gain life this turn.
{2}{R}
Scalding Salamander
Creature - Salamander
Whenever Scalding Salamander attacks, you may have it deal 1 damage to each creature without flying defending player controls.
2 /
1
{7}
Scour from Existence
Instant
Exile target permanent.
{2}{R}
Seething Song
Instant
Add {R}{R}{R}{R}{R}.
--
Shivan Gorge
Legendary Land
{T}: Add {C}.
{2}{R}, {T}: Shivan Gorge deals 1 damage to each opponent.
{1}{R}
Smash to Smithereens
Instant
Destroy target artifact. Smash to Smithereens deals 3 damage to that artifact's controller.
--
Smoldering Crater
Land
Smoldering Crater enters the battlefield tapped.
{T}: Add {R}.
Cycling {2} ({2}, Discard this card: Draw a card.)
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{4}
Solemn Simulacrum
Artifact Creature - Golem
When Solemn Simulacrum enters the battlefield, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
When Solemn Simulacrum dies, you may draw a card.
2 /
2
{2}{R}
Soul Sear
Instant
Soul Sear deals 5 damage to target creature or planeswalker. That permanent loses indestructible until end of turn.
{3}{R}
Spitfire Lagac
Creature - Lizard
Landfall -- Whenever a land enters the battlefield under your control, Spitfire Lagac deals 1 damage to each opponent.
3 /
4
{6}
Staff of Nin
Artifact
At the beginning of your upkeep, draw a card.
{T}: Staff of Nin deals 1 damage to any target.
{X}{R}
Sudden Demise
Sorcery
Choose a color. Sudden Demise deals X damage to each creature of the chosen color.
{2}
Swiftfoot Boots
Artifact - Equipment
Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip {1}
{3}
Temple Bell
Artifact
{T}: Each player draws a card.
--
Temple of the False God
Land
{T}: Add {C}{C}. Activate only if you control five or more lands.
{1}{R}
Thrill of Possibility
Instant
As an additional cost to cast this spell, discard a card.
Draw two cards.
{1}{R}{R}{R}
Torbran, Thane of Red Fell
Legendary Creature - Dwarf Noble
If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.
2 /
4
{1}{R}
Tormenting Voice
Sorcery
As an additional cost to cast this spell, discard a card.
Draw two cards.
{3}{R}
Transmogrify
Sorcery
Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library.
Put any number of cards from your hand on the bottom of your library, then draw that many cards plus one.
--
Valakut Stoneforge
Land
Valakut Stoneforge enters the battlefield tapped.
{T}: Add {R}.
--
Valakut, the Molten Pinnacle
Land
Valakut, the Molten Pinnacle enters the battlefield tapped.
Whenever a Mountain enters the battlefield under your control, if you control at least five other Mountains, you may have Valakut, the Molten Pinnacle deal 3 damage to any target.
{T}: Add {R}.
{1}{R}{R}
Vulshok Sorcerer
Creature - Human Shaman
Haste
{T}: Vulshok Sorcerer deals 1 damage to any target.
1 /
1
{1}
Wayfarer's Bauble
Artifact
{2}, {T}, Sacrifice Wayfarer's Bauble: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
{R}{R}
Wild Guess
Sorcery
As an additional cost to cast this spell, discard a card.
Draw two cards.
{3}{R}
Wojek Embermage
Creature - Human Wizard
Radiance -- {T}: Wojek Embermage deals 1 damage to target creature and each other creature that shares a color with it.