msem-instigator

Cast Khalizors' Last Stand only during your postcombat main phase.
Gain control of target creature until end of turn. Untap all creatures you control. They gain haste until end of turn. After this phase, there is an additional combat phase followed by an additional main phase.

Target creature gets +1/+3 until end of turn.

Destroy target attacking creature.

Destroy target creature. If you do, you may put a +1/+1 counter on a creature you control.

Flash
When Kimar, Lightforger enters, she deals damage equal to her power to each attacking creature.
At end of combat, if three or more creatures died this turn, exile Kimar, then return her to the battlefield transformed under her owner's control.

[+1]: Choose up to one target creature. Until your next turn, whenever that creature attacks you or Kimar, Kimar deals 4 damage to that creature.
[–1]: Put a +1/+1 counter on target creature. That creature gains lifelink until end of turn.
[–7]: Search your library for a creature card and put it onto the battlefield. You gain life equal to its power. Then shuffle.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, scry 1, then exile the top card of your library. Until end of turn, you may play that card.

[+1]: Until your next turn, up to one target creature gets -9/-0.
[–2]: Reveal the top four cards of your library. Put any number of cards with mana abilities from among them into your hand, then put the rest on the bottom of your library in any order.
[–6]: You get an emblem with “At the beginning of each opponent's end step, gain control of target creature that player controls.”

Lifelink
Whenever a creature with power less than Kiri, Cloudwalker's power you control enters, you may pay {W}. If you do, you gain 2 life and draw a card.

Enchant Forest
When Kiss of the Dryad enters, you gain 3 life and draw a card.
Enchanted land has “{T}: Add one mana of any color.”

When Kiyomi's Disciple enters, put target creature card from a graveyard onto the battlefield under your control. When Kiyomi's Disciple is no longer on the battlefield, that creature's controller sacrifices it.

Equipped creature gets +2/+2.
Art of war — At the beginning of your end step, if equipped creature dealt damage to an opponent this turn, you may return target creature card from your graveyard to your hand.
Equip {2}

Whenever Knight of the Hawk deals combat damage to a player, you may sacrifice it. If you do, search your library for a red legendary creature card, reveal it, put it into your hand, then shuffle.

Whenever Knight of the Raven deals combat damage to a player, you may sacrifice it. If you do, search your library for a black legendary creature card, reveal it, put it into your hand, then shuffle.

Whenever Knight of the Staff deals combat damage to a player, you may sacrifice it. If you do, search your library for a blue legendary creature card, reveal it, put it into your hand, then shuffle.

Whenever Knight of the Stag deals combat damage to a player, you may sacrifice it. If you do, search your library for a white legendary creature card, reveal it, put it into your hand, then shuffle.

Whenever Knight of the Verdigris deals combat damage to a player, you may sacrifice it. If you do, search your library for a green legendary creature card, reveal it, put it into your hand, then shuffle.

When Knight's Attendant enters, create a 2/2 white Knight creature token with vigilance.

Enchant creature
When Knight's Daring enters, put two +1/+1 counters on enchanted creature.
Whenever enchanted creature deals combat damage to a player, put a +1/+1 counter on each creature you control with a +1/+1 counter on it.

Create a 2/2 white Knight creature token with vigilance, then populate. (Create a token that's a copy of a creature token you control.)

Enchant creature
When Knightly Valor enters, create a 2/2 white Knight creature token with vigilance. (Attacking doesn't cause it to tap.)
Enchanted creature gets +2/+2 and has vigilance.

Whenever Knowledge Extractor deals combat damage to a player, draw a card.

Double strike
Art of war — At the beginning of your end step, if Kogane's Swordmaster dealt damage to an opponent this turn, put a +1/+1 counter on it.

Equipped creature gets +2/+2.
Art of war — At the beginning of your end step, if equipped creature dealt damage to an opponent this turn, create a 1/1 colorless Samurai creature token.
Equip {2}

First strike
Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
{6}, {T}: Search your library for a creature card with distorted, put it onto the battlefield, then shuffle.