msem-instigator

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.)

Lightwalker has flying as long as it has a +1/+1 counter on it.

Creatures you control get +1/+1 until end of turn. Enchantment creatures you control gain vigilance until end of turn.
Flashback {4}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{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.)

{T}, Pay 1 life: Add {B}.
{7}{B}{B}, Exile Ligos, Shadow's Source from your hand: Destroy all creatures you don't control. They can't be regenerated.

Hexproof from spells cast from a graveyard
If a creature you control would die and that creature was the target of an instant or sorcery spell this turn, you may put it on top of its owner's library instead.

Vigilance
Lijing has indestructible as long as a Fox you control entered this turn.
Whenever an opponent draws a card, draw a card unless that player has you create a 2/1 red and white Fox creature token.

First mate — Each nonland card in your starting deck has “+1/+1 counter” or “harmonize” in its printed rules text. (If this card outside the game is your chosen first mate, you may swap it with a card in your opening hand.)
Once each turn, if one or more +1/+1 counters would be put on a permanent you control, you may put twice that many of those counters on it instead.
Once each turn, if you would trigger a harmony ability of a permanent you control, you may have that ability trigger twice instead.

At the beginning of your end step, put a -1/-1 counter on each creature you control.
[+1]: Create two 2/2 black Zombie creature tokens.
[0]: Whenever a creature dies this turn, you draw a card and you lose 1 life.
[–4]: Target opponent gets an emblem with “At the beginning of your end step, put a -1/-1 counter on each creature you control.”

Advance {2} (Cast this for {2} to advance it as it enters. {2}: Advance this as a sorcery.)
Equipped creature gets +1/+1 for each artifact you control.
Equipped creature must be blocked by an additional creature for each time it and this artifact have advanced this turn to be blocked.
Equip {3}

When Limbhacker Blade enters, each opponent discards a card.
Equipped creature gets +2/+0.
Equip {2}

Lifelink
Attain {4}{W} ({4}{W}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

When Limited Mortality enters, return up to one target creature card from your graveyard to your hand.
{1}{B}, Sacrifice Limited Mortality: Return target creature card from your graveyard to your hand. Activate only as a sorcery.

Flash
Whenever a creature you control deals combat damage to a player, create a Treasure token, then exile the top card of that player's library. You may play cards exiled this way for as long as they remain exiled.

Haste
Deploy 5 (As this enters, you may tap any number of other creatures you control with total power 5 or more.)
When Line Officer enters deployed, it deals 3 damage to each creature your opponents control.

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

When Lingering Guide enters, mill two cards.

Trample
Engage (This creature must be blocked each combat if able.)
When Lion's Vanguard enters, creatures you control get +3/+3 and gain trample and haste until end of turn.

When Lionfrill Hunter enters or when you cycle it, put X +1/+1 counters on another target creature you control, where X is the number of cards with a cycling ability in your graveyard.
Cycling {3}{R}{G} ({3}{R}{G}, Discard this card: Draw a card.)

Destroy target artifact or land. If {U} was spent to cast Liquefaction, draw a card.

Once each turn, when another creature you control dies, you may create a token that's a copy of it, except it's a Treasure artifact with “{T}, Sacrifice this artifact: Add one mana of any color.” (It loses its other types.)

Aura and Equipment spells you cast cost {1} less to cast.