msem-instigator

Flying
Whenever Liege of Iekin attacks, tap target permanent an opponent controls. It doesn't untap during its controller's next untap step.

At the beginning of combat on your turn, target creature gets +1/+1 and gains haste until end of turn.

Trample

Menace
Whenever Lieshi Pariah deals combat damage, you lose that much life unless it's in a pack. (Two or more creatures you control with equal power are in a pack.)

Any number of target creatures you control each have base power and toughness 3/3 and become Beasts in addition to their other types until end of turn.
Reconstruct {2}{G}{G} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)

Create an X/X Elemental creature token that's all colors.
Reconstruct {X}{G}{G}{G} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)

When Life from Death enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token.

Destroy target creature. Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Whenever a +1/+1 counter is put on Lifeblood Leecher, target creature an opponent controls gets -1/-1 until end of turn.

Pay 2 life: Lifecraft Aberration gains indestructible until end of turn.
Pay 3 life: Lifecraft Aberration gets +1/+1 until end of turn.

When Lifespark Alchemist enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Whenever Lifespark Alchemist or another creature dies, each opponent loses 1 life.

Reach
Each other creature you control gets +1/+1 for each +1/+1 counter on it.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

Whenever you gain life for the first time each turn, each opponent loses 2 life.

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you gain life equal to the greatest power among creatures you control.

As an additional cost to cast this spell, tap X untapped creatures you control.
Lightning Chorus deals X damage to any target and you gain X life.

Haste
At the beginning of each end step, if Lightning Ox dealt damage this turn, sacrifice it.

Lightning Ripple deals 4 damage divided as you choose among any number of target creatures and/or planeswalkers.

If you would harmonize while this spell is on the stack, you may instead put three thunder counters on this spell.
Lightning and Thunder deals X damage to any target, where X is 3 plus the number of thunder counters on Lightning and Thunder.

Haste
You may cast sorcery and enchantment spells as though they had flash.
Whenever you cast an enchantment, instant, or sorcery spell, Lightning-Fast Lionfish gets +1/+0 and gains first strike until end of turn.

Whenever Lightseeker Nymph perseveres, search your library for a basic land card, put it onto the battlefield tapped, then shuffle. (A creature perseveres when it survives damage.)

{B}, Sacrifice a creature: Put a +1/+1 counter on Lightwrencher.

You may have Ligneous Enormity assign its combat damage as though it weren't blocked.
Madness {3}{G}{G} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

When Lilyreed Triton enters, create a white Aura enchantment token named Triton's Gift attached to target creature. The token has enchant creature and “Enchanted creature gets +1/+0 and can't be blocked by creatures with power 3 or greater.”

Trample
{2}{R}{G}: Creatures you control get +1/+1 until end of turn.