Acidic Soil deals damage to each player equal to the number of lands they control.

Whenever a creature enters the battlefield, Aether Flash deals 2 damage to it.

Whenever an opponent casts a creature spell, Aether Sting deals 1 damage to that player.

When Akki Blizzard-Herder dies, each player sacrifices a land.

At the beginning of each player's upkeep, Ancient Runes deals damage to that player equal to the number of artifacts they control.

Anger of the Gods deals 3 damage to each creature. If a creature dealt damage this way would die this turn, exile it instead.

If a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

At the beginning of each player's end step, Antagonism deals 2 damage to that player unless one of their opponents was dealt damage this turn.

Choose target creature. Whenever that creature is dealt damage this turn, it deals that much damage to each other creature and each player.

First strike, haste

Whenever a player casts a spell from a graveyard, Ash Zealot deals 3 damage to that player.

Each enchantment deals 2 damage to its controller, then each Aura attached to a creature deals 2 damage to the creature it's attached to.

All creatures have double strike and attack each combat if able.

Nonbasic lands are Mountains.

When Blood Sun enters the battlefield, draw a card.

All lands lose all abilities except mana abilities.

You may exile a red card from your hand rather than pay this spell's mana cost.

Cave-In deals 2 damage to each creature and each player.

At the beginning of each upkeep, count the number of permanents. If the number is odd, until end of turn, red creatures get +1/+1 and whenever a player taps a Mountain for mana, that player adds an additional {R}. If the number is even, until end of turn, red creatures get -1/-1 and if a player taps a Mountain for mana, that Mountain produces colorless mana instead of any other type.

Target spell or permanent becomes red. (Its mana symbols remain unchanged.)

Whenever an artifact, creature, or enchantment enters the battlefield, its controller chooses target permanent another player controls that shares a card type with it. Exchange control of those permanents.

Each player sacrifices a permanent.

Flash

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Whenever Etali, Primal Storm attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs.

If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.

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.

Flamebreak deals 3 damage to each creature without flying and each player. Creatures dealt damage this way can't be regenerated this turn.

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Each player may play an additional land on each of their turns.

At the beginning of each player's upkeep, if that player has no cards in hand, that player draws three cards.

If a creature you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

{T}: Heartless Hidetsugu deals damage to each player equal to half that player's life total, rounded down.

At the beginning of your upkeep, if there are seven or more lands on the battlefield, sacrifice Impending Disaster and destroy all lands.

Inferno deals 6 damage to each creature and each player.

Damage can't be prevented this turn. If a source you control would deal damage this turn, it deals double that damage instead.

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Aftermath (Cast this spell only from your graveyard. Then exile it.)

Injury deals 2 damage to target creature and 2 damage to target player or planeswalker.

Imprint -- When Knowledge Pool enters the battlefield, each player exiles the top three cards of their library.

Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with Knowledge Pool without paying its mana cost.

If Leyline of Punishment is in your opening hand, you may begin the game with it on the battlefield.

Players can't gain life.

Damage can't be prevented.

Nonbasic lands are Mountains.

At the beginning of each player's end step, put a charge counter on Mana Cache for each untapped land that player controls.

Remove a charge counter from Mana Cache: Add {C}. Any player may activate this ability but only during their turn before the end step.

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Instant and enchantment spells you cast cost up to {2} less to cast.

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

All creatures have haste.

Destroy target land. If that land was nonbasic, Molten Rain deals 2 damage to the land's controller.

({T}: Add {R}.)

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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.

{T}: Add {C}.

{2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

Destroy target artifact or land. It can't be regenerated.

At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice Planar Chaos.

Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell.

Whenever a player taps a land for mana, if it's not that player's turn, destroy that land.

Price of Progress deals damage to each player equal to twice the number of nonbasic lands that player controls.

Pyroclasm deals 2 damage to each creature.

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.

{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.

Each player discards their hand, then draws seven cards.

Miracle {1}{R} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Whenever a creature is dealt damage, Repercussion deals that much damage to that creature's controller.

Destroy target land, then Roiling Terrain deals damage to that land's controller equal to the number of land cards in that player's graveyard.

Red spells you cast cost {1} less to cast.

{T}: Add {C}.

{2}{R}, {T}: Shivan Gorge deals 1 damage to each opponent.

Players can't gain life this turn. Damage can't be prevented this turn. Skullcrack deals 3 damage to target player or planeswalker.

{T}: Add {C}{C}.

Destroy target land. Star of Extinction deals 20 damage to each creature and each planeswalker.

Exile target artifact or land. Structural Distortion deals 2 damage to that permanent's controller.

Sudden Impact deals damage to target player equal to the number of cards in that player's hand.

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.

At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the highest mana value takes an extra turn after this one. If two or more players' cards are tied for highest, the tied players repeat this process until the tie is broken.

At the beginning of each player's upkeep, that player reveals a card at random from their hand. If it's a land card, the player puts it onto the battlefield. Otherwise, the player casts it without paying its mana cost if able.

Whenever a land enters the battlefield, Zo-Zu the Punisher deals 2 damage to that land's controller.