msem-instigator

Krismite Shard enters tapped.
{1}, {T}, Sacrifice Krismite Shard: Aetherize target creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)

{T}: Add {C}.
When Krismite Vault is put into a graveyard from the battlefield, create a tapped colorless artifact token named Mox Krismite with “{T}: Add one mana of any color.”

{T}: Add {C}.
Tap an untapped creature you control: Kurayami Shrine becomes a 1/1 Spirit creature with deathtouch until end of turn. It's still a land.

{4}{W}: Tap target creature.

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Lag Spike deals 3 damage to target [blocking] creature.

First strike
When a creature scavenges Laiyru Huntsman, put a first strike counter on that creature.
Scavenge {2}{R} ({2}{R}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

When Laiyru Lumberjacks dies, mill four cards, then return a land card from your graveyard to your hand.

{T}: Target land you control becomes the basic land type of your choice until end of turn.
At the beginning of each end step, if you spent three or more colors of mana to cast spells this turn, surveil 1.

Laiyru Shrine enters tapped.
{T}: Add {G} or {U}.
{G/U}, {T}, Sacrifice Laiyru Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Whenever one or more creatures you control deal damage to a player, put a charge counter on Lake of Rage.
{T}: Add {C}.
{T}, Remove a charge counter from Lake of Rage: Add one mana of any color.

({T}: Add {W} or {U}.)
As Lakeside Park enters, you may pay {1}. If you don't, Lakeside Park enters tapped.

{T}: Add {R}.
Whenever you cast a spell from anywhere other than your hand, copy that spell. You may choose new targets for the copy.

{T}, Pay 1 life: Add {U} or {R}.
{2}, {T}, Sacrifice Lamplit Thoroughfare and another permanent: Draw a card. Activate only during your turn.

Lantern-Bearer Belle gets +2/+0 and has flying as long as you've sacrificed a permanent this turn.

Tribute 1 (As this creature enters, an opponent of your choice may put a +1/+1 counter on it.)
When Lasis Persecutor enters, if tribute wasn't paid, it gains deathtouch. (This effect lasts indefinitely.)

Target creature gets +X/+0 until end of turn, where X is the number of instant and sorcery cards in your graveyard.

First strike
{R}, Discard a land card: Put a +1/+1 counter on Lavamancer Adept. It gains menace until end of turn.

({T}: Add {B} or {R}.)
Lavatorn Fields enters tapped unless you control a basic Swamp or a basic Mountain.

Counter target spell that targets you or a permanent you control.
Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

As Legacy Foundations enters, you may reveal a Plains or Swamp card from your hand. If you don't, Legacy Foundations enters tapped.
{T}: Add {W} or {B}.

Enchant creature
As Legacy of Frondpond enters, choose a creature type.
Enchanted creature gets +2/+1, has deathtouch, and is the chosen type in addition to its other types.

Enchant creature
Enchanted creature has “Whenever this creature attacks, attacking creatures you control get +1/+1 until end of turn.”

Exile target artifact or enchantment. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

{B}, {T}, Discard a card: Create a 1/1 black Skeleton creature token.
{B}, {T}, Sacrifice a creature: Put a +1/+1 counter on each Skeleton you control.