Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase.

Choose a Background (You can have a Background as a second commander.)

Flying, protection from black

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 Karmic Guide enters, return target creature card from your graveyard to the battlefield.

+1: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it.

−1: Put a card you own with a silver counter on it from exile into your hand.

−2: Create a 0/0 colorless Construct artifact creature token with "This creature gets +1/+1 for each artifact you control."

Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn. <I>(It retains its abilities.)</I>

Tap an untapped snow land you control: Karplusan Giant gets +1/+1 until end of turn.

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.

Whenever Karplusan Wolverine becomes blocked, you may have it deal 1 damage to any target.

Flying, haste

When Karrthus, Tyrant of Jund enters, gain control of all Dragons, then untap all Dragons.

Other Dragon creatures you control have haste.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Other Rats you control have toxic 1.

When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order.

Enchant creature

Enchanted creature loses all abilities and has base power and toughness 1/1.

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.

This spell can't be countered.

: Kavu Chameleon becomes the color of your choice until end of turn.

: Kavu Glider gets +0/+1 until end of turn.

: Kavu Glider gains flying until end of turn.

Whenever a creature with power 4 or greater enters, its controller draws a card.

Kavu creatures have trample.

Whenever another Kavu enters, put a +1/+1 counter on Kavu Monarch.

Kicker (You may pay an additional as you cast this spell.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

If Kavu Primarch was kicked, it enters with four +1/+1 counters on it.

Kavu Runner has haste as long as no opponent controls a white or blue creature.

Kicker (You may pay an additional as you cast this spell.)

If Kavu Titan was kicked, it enters with three +1/+1 counters on it and with trample.

0: Exile CARDNAME haunting target creature for as long as that creature remains on the battlefield.

−1: You get an emblem with, "At the beginning of your upkeep, this emblem deals 3 damage to the owner of target haunted creature."

−2: You get an emblem with, "At the beginning of your upkeep, gain control of target haunted creature for as long as it remains haunted."

Whenever one or more creatures you control and/or creature cards in your graveyard are put into exile, you may choose a creature card from among them. Until end of turn, target token you control becomes a copy of it, except it has flying.

+2: Surveil 2, then exile a card from a graveyard.

+1: Create a 1/1 white and black Spirit creature token with flying.

−2: Exile target creature you control. For each other player, exile up to one target creature that player controls.

Target creature gets +1/+1 and gains double strike until end of turn.

Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Look at the top seven cards of your library. Put up to X artifact and/or creature cards with mana value 3 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Landfall — Whenever a land you control enters, Kazandu Mammoth gets +2/+2 until end of turn.

Kazandu Refuge enters tapped.

When Kazandu Refuge enters, you gain 1 life.

: Add or .

Level up (: Put a level counter on this. Level up only as a sorcery.)

LEVEL 2-5

1/1

: Create a 3/3 green Elephant creature token.

LEVEL 6+

1/1

: Create two 3/3 green Elephant creature tokens.

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.

Whenever a creature an opponent controls attacks, if you're the defending player, create a 3/3 red Ogre creature token unless that creature's controller pays .

As an additional cost to cast this spell, sacrifice a creature.

Kazuul's Fury deals damage equal to the sacrificed creature's power to any target.

At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand.

: Keeper of Kookus gains protection from red until end of turn.

Flying, indestructible

Kefnet the Mindful can't attack or block unless you have seven or more cards in hand.

: Draw a card, then you may return a land you control to its owner's hand.

Vanishing 2 (This creature enters with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

When Keldon Marauders enters or leaves the battlefield, it deals 1 damage to target player or planeswalker.

When Kellan Joins Up enters, you may exile a nonland card with mana value 3 or less from your hand. If you do, it becomes plotted. (You may cast it as a sorcery on a later turn without paying its mana cost.)

Whenever a legendary creature you control enters, put a +1/+1 counter on each creature you control.

Flying, vigilance

Whenever Kellan, Inquisitive Prodigy attacks, destroy up to one target artifact. If you controlled that permanent, draw a card.

: Untap another target permanent you control.

: Tap target permanent. Activate only if you control eight or more lands.

Whenever Kemba, Kha Enduring or another Cat you control enters, attach up to one target Equipment you control to that creature.

Equipped creatures you control get +1/+1.

: Create a 2/2 white Cat creature token.

When Kemuri-Onna enters, target player discards a card.

Whenever you cast a Spirit or Arcane spell, you may return Kemuri-Onna to its owner's hand.

: All creatures gain trample and haste until end of turn.

: Put a +1/+1 counter on target creature.

: Target player gains 5 life.

: Target player draws a card.

: Put target creature card from a graveyard onto the battlefield under its owner's control.

Companion — Your starting deck contains only cards with mana value 3 or greater and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)

When Keruga, the Macrosage enters, draw a card for each other permanent you control with mana value 3 or greater.

Whenever Kessig Naturalist attacks, add or . Until end of turn, you don't lose this mana as steps and phases end.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

: Add .

, : Target creature gets +X/+0 and gains trample until end of turn.

At the beginning of your end step, you may sacrifice another creature. If you do, reveal cards from the top of your library until you reveal a nonlegendary creature card with lesser mana value, put it onto the battlefield, then put the rest on the bottom of your library in a random order.

, , Sacrifice Keys to the House: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

, , Sacrifice Keys to the House: Lock or unlock a door of target Room you control. Activate only as a sorcery.

Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)

Defender

, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness.

Menace

Whenever Kheru Mind-Eater deals combat damage to a player, that player exiles a card from their hand face down.

You may look at cards exiled with Kheru Mind-Eater, and you may play lands and cast spells from among those cards.

For each player, choose friend or foe. Each friend discards all cards from their hand, then draws that many cards plus one. Khorvath's Fury deals damage to each foe equal to the number of cards in their hand.

: Exile the top card of your library. If it's a land card, put it into your hand. Otherwise, put a study counter on it.

: Create a 0/0 green and blue Fractal creature token. Put a +1/+1 counter on it for each different mana value among nonland cards you own in exile with study counters on them.

, : Target creature deals damage to itself equal to its power.

Choose one or more —

• Destroy target artifact.

• Destroy target creature.

• Kill Maim Burn deals 3 damage to target player.