When Jadelight Spelunker enters, it explores X times. (To have it explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

Jagged Lightning deals 3 damage to each of two target creatures.

Search your library for up to X basic land cards, where X is the number of creatures attacking you, put those cards onto the battlefield tapped, then shuffle.

Prevent all combat damage that would be dealt this turn.

Spree (Choose one or more additional costs.)

+ — Put a +1/+1 counter on target creature. It can't be blocked this turn.

+ — Target artifact or creature's owner puts it on the top or bottom of their library.

, : Shuffle Jalum Grifter and two lands you control face down. Target opponent chooses one of those cards. Turn the cards face up. If they chose Jalum Grifter, sacrifice it. Otherwise, destroy target permanent.

Trample

Whenever you cast a historic spell, Jamie McCrimmon gets +X/+X until end of turn, where X is that spell's mana value. (Artifacts, legendaries, and Sagas are historic.)

Doctor's companion (You can have two commanders if the other is the Doctor.)

, : Target creature can't block this turn.

Whenever Jangling Automaton attacks, untap all creatures defending player controls.

Remove a ki counter from Jaraku the Interloper: Counter target spell unless its controller pays .

When Jared Carthalion, True Heir enters, target opponent becomes the monarch. You can't become the monarch this turn.

If damage would be dealt to Jared Carthalion while you're the monarch, prevent that damage and put that many +1/+1 counters on it.

(CARDNAME isn't a spell, it's affected by summoning sickness, it's blue, and it has ": Add .")

CARDNAME enters the battlefield tapped.

CARDNAME doesn't untap during your untap step.

At the beginning of your upkeep, you may pay . If you do, untap CARDNAME.

: Add . Spend this mana only to cast creature spells with no abilities.

Creatures you control with no abilities can't be blocked by creatures with abilities.

Whenever a Zombie or Mutant you control dies, if its power was different from its base power, draw a card.

Come Fly With Me — , Sacrifice a creature: Put a +1/+1 counter on target creature you control. It gains flying until end of turn.

Flash

When Javelin of Lightning enters, attach it to target creature you control.

During your turn, equipped creature gets +2/+0 and has first strike.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Target red creature gains haste until end of turn.

+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.

Whenever Jedit Ojanen, Mercenary or another legendary creature you control enters, you may pay . If you do, create a 2/2 green Cat Warrior creature token with forestwalk. (It can't be blocked as long as defending player controls a Forest.)

When Jeering Homunculus enters, you may goad target creature. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Companion — No card in your starting deck has more than one of the same mana symbol in its mana cost. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)

: Add . This mana can't be spent to pay generic mana costs.

Flying

When Jeleva, Nephalia's Scourge enters, each player exiles the top X cards of their library, where X is the amount of mana spent to cast Jeleva.

Whenever Jeleva attacks, you may cast an instant or sorcery spell from among cards exiled with Jeleva without paying its mana cost.

Partner with Madame Vastra

First strike

Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)

Whenever you sacrifice a Clue or Food, put a +1/+1 counter on another target creature you control.

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

Whenever you cast a noncreature spell, creatures you control get +1/+1 until end of turn. Untap those creatures.

Whenever you cast a noncreature spell, you may draw a card. If you do, discard a card.

Flash (You may cast this spell any time you could cast an instant.)

Defender

When Jeskai Barricade enters, you may return another target creature you control to its owner's hand.

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

Whenever Jeskai Elder deals combat damage to a player, you may draw a card. If you do, discard a card.

Enchant creature

Enchanted creature gets +2/+2.

Enchanted creature has flying as long as you control a red or white permanent.

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

Choose one. If you control a commander as you cast this spell, you may choose both instead.

• Add for each card in target opponent's hand.

• Exile the top three cards of your library. You may play them this turn.

Living metal (During your turn, this Vehicle is also a creature.)

Flying

: Convert Jetfire, then adapt 3. (If it has no +1/+1 counters on it, put three +1/+1 counters on it.)

Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures.

Creatures you control also get +1/+0 and have trample as long as you control six or more creatures.

Creatures you control also get +1/+0 and have double strike as long as you control nine or more creatures.

(: Add , , or .)

Jetmir's Garden enters tapped.

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

Flying

Whenever Jetting Glasskite becomes the target of a spell or ability for the first time each turn, counter that spell or ability.

Remove Jeweled Bird from your deck before playing if you're not playing for ante.

: Ante Jeweled Bird. If you do, put all other cards you own from the ante into your graveyard, then draw a card.

: Prevent the next 1 damage that would be dealt to any target this turn.

: Target creature can't be blocked this turn.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Islandcycling , swampcycling (, Discard this card: Search your library for an Island or Swamp card, reveal it, put it into your hand, then shuffle.)

: Put two ingenuity counters on Jhoira, Ageless Innovator, then you may put an artifact card with mana value X or less from your hand onto the battlefield, where X is the number of ingenuity counters on Jhoira.

Flying

Historic spells you cast cost less to cast. (Artifacts, legendaries, and Sagas are historic.)

: Regenerate target artifact creature.

+1: Target creature gets +2/+2 until end of turn.

−1: If you don't control a creature named Mowu, create Mowu, a legendary 3/3 green Dog creature token.

−5: Until end of turn, target creature gains trample and gets +X/+X, where X is the number of lands you control.

As Jihad enters, choose a color and an opponent.

White creatures get +2/+1 as long as the chosen player controls a nontoken permanent of the chosen color.

When the chosen player controls no nontoken permanents of the chosen color, sacrifice Jihad.

Ward

Whenever you cast a noncreature spell with mana value 3 or greater, draw a card.

: Exile Jin-Gitaxias, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if you have seven or more cards in hand.

Whenever you cast an artifact, instant, or sorcery spell, copy that spell. You may choose new targets for the copy. This ability triggers only once each turn. (A copy of a permanent spell becomes a token.)

Whenever an opponent casts an artifact, instant, or sorcery spell, counter that spell. This ability triggers only once each turn.

Target land becomes the basic land type of your choice until end of turn.

Draw a card at the beginning of the next turn's upkeep.

At the beginning of your upkeep, Jinxed Idol deals 2 damage to you.

Sacrifice a creature: Target opponent gains control of Jinxed Idol.

When Jirina Kudro enters, create a 1/1 white Human Soldier creature token for each time you've cast a commander from the command zone this game.

Other Humans you control get +2/+0.