msem-instigator

Enchant creature
Enchanted creature gains +X/+X, where X is your life total.
When enchanted creature dies, shuffle Life's Will into its owner's library.

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

When Lifebreather enters, you gain 4 life.
Revive {4}{W} ({4}{W}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

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

{T}: Add one mana of any color.
{2}, {T}: Choose a color. Add X mana of the chosen color, where X is the number of permanents you control that could produce mana of that color.

When Lifegorging Aberration enters, each opponent loses X life, where X is the number of Zombies you control. You gain life equal to the life lost this way.

Kindle 4—{4}{U}{U} ({4}{U}{U}, Exile this card from your graveyard: Create four 1/1 colorless Elemental creature tokens. Kindle only as a sorcery.)

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 (This creature can block creatures with flying.)
Whenever Lifespinner Spider blocks or becomes blocked by a creature with flying, you gain 1 life.

Rouse 3. Untap target land. It gains flying and haste until end of turn if it's a creature. (Distribute three +1/+1 counters among permanents you control. If they aren't creatures, tap them and they become 0/0 creatures in addition to their other types.)

Enchant creature
When Lifted Spirits enters, create a 1/1 white Spirit creature token with flying.
Enchanted creature gets +1/+1 and has flying.

Light the Fuse deals 3 damage to target creature or planeswalker. Whenever a permanent dealt damage by Light the Fuse this turn dies this turn, repeat that process.

Whenever you cast a white spell, create a 1/1 white Nymph creature token.

When Lightblessed Claymore enters, attach it to target creature you control.
Equipped creature gets +2/+0 and has lifelink.
Equip {4}

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
{W}, {T}: Lightbolt Archer deals 1 damage to target unblocked attacking creature.

Whenever a token enters, you may have it become a 3/3 green Elemental creature.

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.)

Whenever another artifact you control enters, put a +1/+1 counter on Lightsteel Enforcer.

{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.)

Flying
If Liguno, Who Transcends All or another permanent you control would be put into a graveyard from the battlefield, exile it instead. Return that card to the battlefield under its owner's control at the beginning of the next end step.