Spells your opponents cast that target a Merfolk you control cost more to cast.

Abilities your opponents activate that target a Merfolk you control cost more to activate.

Double strike

Equipped Warriors you control have double strike.

When Kor Cartographer enters, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.

Whenever Kor Celebrant or another creature you control enters, you gain 1 life.

All damage that would be dealt this turn to target creature you control by a source of your choice is dealt to another target creature instead.

Rally — Whenever Kor Entanglers or another Ally you control enters, tap target creature an opponent controls.

Equipped creature gets +1/+1 and has vigilance.

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

When Kor Hookmaster enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

When Kor Outfitter enters, you may attach target Equipment you control to target creature you control.

Kor Scythemaster has first strike as long as it's attacking.

Flying

When Kor Skyfisher enters, return a permanent you control to its owner's hand.

Korlash, Heir to Blackblade's power and toughness are each equal to the number of Swamps you control.

: Regenerate Korlash.

Grandeur — Discard another card named Korlash, Heir to Blackblade: Search your library for up to two Swamp cards, put them onto the battlefield tapped, then shuffle.

All Swamps are 1/1 black creatures that are still lands.

: Target creature gets +1/+1 and gains intimidate until end of turn. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.)

, Sacrifice a nontoken creature: Create X 1/1 green Saproling creature tokens, where X is the sacrificed creature's toughness.

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

I, II — Create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

III — Exile the top three cards of target opponent's library. You may play those cards this turn.

This spell costs less to cast for each card type among permanents you've sacrificed this turn.

Flying, trample, haste

Whenever Korvold deals combat damage to a player, put X +1/+1 counters on Korvold and draw X cards, where X is the number of permanent types among cards in your graveyard.

At the beginning of your upkeep, sacrifice Koskun Falls unless you tap an untapped creature you control.

Creatures can't attack you unless their controller pays for each creature they control that's attacking you.

+1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land.

−2: Add for each Mountain you control.

−5: You get an emblem with "Mountains you control have ‘: This land deals 1 damage to any target.'"

Flying

Whenever a permanent owned by another player is put into a graveyard from the battlefield, you draw a card and you lose 1 life.

Vehicles you control have crew 2.

At the beginning of combat on your turn, target artifact creature you control gains lifelink and vigilance until end of turn.

When you cast this spell, draw four cards.

Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)

When Kozilek, Butcher of Truth is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

When you cast this spell, up to two target players each manifest two cards from their hands. For each card manifested this way, you draw a card. (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.)

Other colorless creatures you control get +3/+2.

: Add .

: Target creature can't block Kozilek's Pathfinder this turn. ( represents colorless mana.)

Devoid (This card has no color.)

Kozilek's Return deals 2 damage to each creature.

Whenever you cast an Eldrazi creature spell with mana value 7 or greater, you may exile Kozilek's Return from your graveyard. If you do, Kozilek's Return deals 5 damage to each creature.

Devoid (This card has no color.)

: Kozilek's Shrieker gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures. represents colorless mana.)

Devoid (This card has no color.)

Whenever you cast a creature spell with mana value 4, 5, or 6, create two 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this creature: Add ."

Whenever you cast a creature spell with mana value 7 or greater, draw three cards.

Minotaur creatures you control have haste.

Whenever a Minotaur you control attacks, it gets +2/+0 until end of turn.

Creatures with power less than the number of Islands you control can't block Kraken of the Straits.

Krakilin enters with X +1/+1 counters on it.

: Regenerate Krakilin.

: Krallenhorde Killer gets +4/+4 until end of turn. Activate only once each turn.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Krallenhorde Killer.

: Kranioceros gets +0/+3 until end of turn.

, Sacrifice two artifacts: Destroy target artifact.

Sacrifice an artifact: Add .

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

If you would roll a die, instead roll two of those dice and ignore one of those results.

Enchant creature

Enchanted creature can't attack or block, and its activated abilities can't be activated.

, Return Krasis Incubation to its owner's hand: Put two +1/+1 counters on enchanted creature.

Reach

Undergrowth — When Kraul Harpooner enters, choose up to one target creature you don't control with flying. Kraul Harpooner gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard, then you may have Kraul Harpooner fight that creature.

Deathtouch

: Kraul Warrior gets +3/+3 until end of turn.

Flying, haste

Whenever an opponent casts their second spell each turn, draw a card.

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

Partner with Regna, the Redeemer (When this creature enters, target player may put Regna into their hand from their library, then shuffle.)

, Sacrifice X creatures: Target player draws X cards and gains X life. Put X +1/+1 counters on Krav, the Unredeemed.

Haste

, Sacrifice an artifact: Put a +1/+1 counter on each Goblin you control.

Whenever an artifact is put into a graveyard from the battlefield, you may pay . If you do, create a 1/1 red Goblin creature token. It gains haste until end of turn.

Whenever Krenko, Tin Street Kingpin attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.

Create two 1/1 red Goblin creature tokens.

Whenever another creature dies, you may put X +1/+1 counters on Kresh the Bloodbraided, where X is that creature's power.

Trample

Whenever a creature you control with power 4 or greater enters, put a +1/+1 counter on Kronch Wrangler.

At the beginning of your upkeep, put a shield counter on target creature an opponent controls.

Whenever you put one or more counters on a creature you don't control, tap that creature and goad it. It gains trample until your next turn. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Reach (This creature can block creatures with flying.)

, Discard a card: Krosan Archer gets +0/+2 until end of turn.

Threshold — Krosan Beast gets +7/+7 as long as seven or more cards are in your graveyard.