msem-instigator

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.

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.)

Creatures you control get +X/+0 and gain first strike until end of turn.

Put two +1/+1 counters on target creature. You gain life equal to that creature's power.

Deathtouch
Vanishing 4 (This creature enters with four time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

When Last-Thought Feeder dies, fateseal 2. (To fateseal 2, look at the top two cards of an opponent's library, then put any number of them on the bottom of that player's library and the rest on top in any order.)

Vanishing 1 (This creature enters with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a creature you control deals combat damage to a player, put a time counter on Lavacore Elemental.

{4}{R}, Sacrifice Lavahurler: It deals 5 damage to target player or planeswalker.

Whenever a player looks at one or more cards in your library or searches your library, Lavamind Elemental deals 2 damage to that player. (This includes you.)
At the beginning of your end step, look at the bottom card of your library. You may put it on top of your library.

{2}{R}, Sacrifice Lavaspark Igniter: It deals 2 damage to target creature.

Menace

{1}{R}: Lavatongue Lizard gets +1/+0 until end of turn.
Ferocious — Whenever Lavatongue Lizard attacks, if you control a creature with power 4 or greater, Lavatongue Lizard gains first strike until end of turn.

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

Whenever a creature you control dies, you may pay {G}. If you do, draw a card.

When Leader of Resistance enters, you may search your library for a Rebel creature card, reveal it, put it into your hand, then shuffle.
Other Rebel creatures you control get +1/+1.

When Leafmantle Dryad enters, if you control a legendary creature, you may search your library for a basic land card and put it onto the battlefield tapped, then shuffle.

Whenever target creature deals combat damage to a player this turn, draw two cards.
Fuse (You may cast one or both halves of this card from your hand.)

Counter target instant or sorcery spell you don't control unless its controller copies it twice. You gain control of those copies and may choose new targets for them.

All creatures have haste and attack each combat if able.
{1}{R}: Led by Fury deals 1 damage to target attacking creature.

Bleed {B/R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Left for Carrion deals 4 damage to target creature.

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

Return target card from your graveyard to your hand.

At the beginning of your upkeep, invigorate 1. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)