msem-instigator

{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.

Whenever Lakeside Trickster becomes tapped, up to one target creature phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)

When Lammasu Roost enters, create a 2/2 blue Lammasu creature token with flying.
{3}{U}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Whenever Lampad of Anathemas or another enchantment you control enters, target creature an opponent controls gets -1/-1 until end of turn.

Choose one —
• Destroy target artifact. Lamplight Explosion deals 1 damage to each opponent.
• Lamplight Explosion deals 1 damage to each creature your opponents control.

{T}: Add {U}. Spend this mana only to activate an ability or cast an instant or sorcery spell.

Vigilance
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

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

Gain control of target land.

Reveal the top four cards of your library. You may put a creature card and/or a land card from among them into your hand. Put the rest into your graveyard, then discard a card if two cards were put into your hand this way.

When Landbirth Elemental enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

When Landbound Ritualist enters, you may put a land card from your hand or graveyard onto the battlefield tapped.

Landfall — Whenever a land you control enters, you may reveal the top card of your library. If it's a land card, put it into your hand.

Lifelink
Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)

Landmender enters with two -1/-1 counters on it.
{1}{G}, Remove a -1/-1 counter from Landmender: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Search your library for a basic Forest card, put it onto the battlefield tapped, then shuffle.
Dominance — If you control the creature with the greatest power or tied for the greatest power, also search your library for a basic non-Forest card, reveal it, put it into your hand, then shuffle.

Other Actors you control get +1/+1.
Whenever a permanent you control transforms, Lantern Tender deals 2 damage to any target and you gain 2 life.

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

Target permanent becomes a colorless Mountain land until the beginning of your next upkeep.

Whenever you cast a spell from anywhere other than your hand, choose one —
• Create a tapped Treasure token.
• Each opponent loses 2 life and you gain 2 life.
• Create a 1/1 colorless Construct Actor creature token.

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.)

Destroy target creature.