Jaws of Stone deals X damage divided as you choose among any number of targets, where X is the number of Mountains you control as you cast this spell.

+1: Create a 1/1 red Monk creature token with prowess.

−1: Exile the top two cards of your library. Choose one of them. You may play that card this turn.

−2: Choose target creature an opponent controls. Whenever you attack this turn, Jaya, Fiery Negotiator deals damage equal to the number of attacking creatures to that creature.

−8: You get an emblem with "Whenever you cast a red instant or sorcery spell, copy it twice. You may choose new targets for the copies."

Jaya's Firenado deals 5 damage to target creature or planeswalker. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

(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.

First strike (This creature deals combat damage before creatures without first strike.)

: Attacking creatures you control get +X/+X until end of turn, where X is the number of attacking creatures.

Jeska, Thrice Reborn enters with a loyalty counter on her for each time you've cast a commander from the command zone this game.

0: Choose target creature. Until your next turn, if that creature would deal combat damage to one of your opponents, it deals triple that damage to that player instead.

−X: Jeska, Thrice Reborn deals X damage to each of up to three targets.

Jeska, Thrice Reborn can be your commander.

Partner

Choose one —

• Put target creature on top of its owner's library.

• Jeskai Charm deals 4 damage to target opponent or planeswalker.

• Creatures you control get +1/+1 and gain lifelink until end of turn.

Jeskai Infiltrator can't be blocked as long as you control no other creatures.

When Jeskai Infiltrator deals combat damage to a player, exile it and the top card of your library in a face-down pile, shuffle that pile, then manifest those cards. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever Jhessian Thief deals combat damage to a player, draw a card.

At the beginning of your end step, target opponent gains control of Jinxed Choker and puts a charge counter on it.

At the beginning of your upkeep, Jinxed Choker deals damage to you equal to the number of charge counters on it.

: Put a charge counter on Jinxed Choker or remove one from it.

Whenever a nontoken permanent is put into your graveyard from the battlefield, Jinxed Ring deals 1 damage to you.

Sacrifice a creature: Target opponent gains control of Jinxed Ring. <I>(This effect lasts indefinitely.)</I>

Whenever you attack with one or more creatures with power 4 or greater, create a Treasure token.

, Sacrifice a Treasure: Jolene, Plundering Pugilist deals 1 damage to any target.

Jorubai Murk Lurker gets +1/+1 as long as you control a Swamp.

: Target creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Joust Through deals 3 damage to target attacking or blocking creature. You gain 1 life.

When Joyful Stormsculptor enters, create two 1/1 blue and red Elemental creature tokens.

Whenever you cast a spell that has convoke, Joyful Stormsculptor deals 1 damage to each opponent and each battle they protect.

Whenever you cast an instant or sorcery spell, choose one —

• That spell gains deathtouch and lifelink.

• Create a 2/2 red Imp creature token with "When this creature dies, it deals 2 damage to each opponent."

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Jukai Liberator deals combat damage to a player, choose land or nonland. Seek a permanent card of the chosen kind.

When you cycle Jund Sojourners or it dies, you may have it deal 1 damage to any target.

Cycling (, Discard this card: Draw a card.)

Just Desserts deals π damage to target creature. (π is the ratio of a circle's circumference to its diameter. (It's a smidgen more than 3.))

Target creature deals damage to itself equal to its power.

At the beginning of your upkeep, Juzám Djinn deals 1 damage to you.

Choose any number of target players or planeswalkers. For each of them, reveal cards from the top of your library until you reveal a nonland card, Kaboom deals damage equal to that card's mana value to that player or planeswalker, then you put the revealed cards on the bottom of your library in any order.

Kaervek's Hex deals 1 damage to each nonblack creature and an additional 1 damage to each green creature.

As long as Kaervek's Torch is on the stack, spells that target it cost more to cast.

Kaervek's Torch deals X damage to any target.

At the beginning of your end step, if Kaito Shizuki entered this turn, he phases out.

+1: Draw a card. Then discard a card unless you attacked this turn.

−2: Create a 1/1 blue Ninja creature token with "This creature can't be blocked."

−7: You get an emblem with "Whenever a creature you control deals combat damage to a player, search your library for a blue or black creature card, put it onto the battlefield, then shuffle."

Whenever one or more creatures you control deal combat damage to a player, you may return one of them to its owner's hand. If you do, you may activate loyalty abilities of Kaito twice this turn rather than only once.

+1: Up to one target creature can't attack or block until your next turn.

0: Draw a card.

−2: Create a 2/2 colorless Drone artifact creature token with deathtouch and "When this creature leaves the battlefield, each opponent loses 2 life and you gain 2 life."

Converge — Kaleidoscorch deals X damage to any target, where X is the number of colors of mana spent to cast this spell.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Kamahl's Sledge deals 4 damage to target creature.

Threshold — If seven or more cards are in your graveyard, instead Kamahl's Sledge deals 4 damage to that creature and 4 damage to that creature's controller.

Sacrifice Kami of False Hope: Prevent all combat damage that would be dealt this turn.

Kami's Flare deals 3 damage to target creature or planeswalker. Kami's Flare also deals 2 damage to that permanent's controller if you control a modified creature. (Equipment, Auras you control, and counters are modifications.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — You may sacrifice a creature. When you do, Kardur's Vicious Return deals 3 damage to any target.

II — Each player discards a card.

III — Return target creature card from your graveyard to the battlefield. Put a +1/+1 counter on it. It gains haste until your next turn.

+1: Create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

−1: Pay any amount of mana. Look at that many cards from the top of your library, then put one of those cards into your hand and the rest on the bottom of your library in a random order.

−7: You get an emblem with "Tap an untapped artifact you control: This emblem deals 1 damage to any target."

: Add .

: Add or . Karplusan Forest deals 1 damage to you.

Cumulative upkeep—Flip a coin. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Whenever you win a coin flip, Karplusan Minotaur deals 1 damage to any target.

Whenever you lose a coin flip, Karplusan Minotaur deals 1 damage to any target of an opponent's choice.

: Karplusan Yeti deals damage equal to its power to target creature. That creature deals damage equal to its power to Karplusan Yeti.

Legendary Snakes you control have shroud. (They can't be the targets of spells or abilities.)

Whenever Kashi-Tribe Elite deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

Whenever Kashi-Tribe Warriors deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

Flying

Whenever one or more Birds you control deal combat damage to a player, choose one —

• You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it.

• Put a +1/+1 counter on each Bird you control.

• Draw a card.

Whenever a creature you control that was turned face up this turn deals combat damage to a player, draw a card.

: Turn target face-down attacking creature you control face up.

+1: Exile up to two target cards from a single graveyard. You gain 2 life if at least one creature card was exiled this way.

−1: Exile target nonland permanent with mana value 1 or less.

−5: Kaya, Orzhov Usurper deals damage to target player equal to the number of cards that player owns in exile and you gain that much life.

Flying

Whenever a creature an opponent controls is dealt damage, put a +1/+1 counter on Kazarov, Sengir Pureblood.

: Kazarov deals 2 damage to target creature.

Menace (This creature can't be blocked except by two or more creatures.)

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Whenever a commander you control deals combat damage to an opponent, it deals that much damage to each other opponent.

Partner (You can have two commanders if both have partner.)

Whenever one or more non-Human creatures you control deal combat damage to a player, draw a card.

, : Choose target opponent who has more life than you do as you activate this ability. Keeper of the Flame deals 2 damage to that player.

Haste

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

When Keldon Champion enters, it deals 3 damage to target player or planeswalker.

Keldon Megaliths enters tapped.

: Add .

Hellbent — , : Keldon Megaliths deals 1 damage to any target. Activate only if you have no cards in hand.

: If Kellan is a Scout, it becomes a Human Faerie Detective and gains "Whenever Kellan deals combat damage to a player, exile the top card of your library. You may play that card this turn."

: If Kellan is a Detective, it becomes a 3/2 Human Faerie Rogue and gains double strike.

Vigilance, haste

Kelsien, the Plague gets +1/+1 for each experience counter you have.

: Kelsien deals 1 damage to target creature you don't control. When that creature dies this turn, you get an experience counter.

Whenever you activate a loyalty ability of a Chandra planeswalker, Keral Keep Disciples deals 1 damage to each opponent.