msem-instigator

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.)

{T}: Add {R}.
Whenever you cast a spell from anywhere other than your hand, copy that spell. You may choose new targets for the copy.

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

(Transcend as a sorcery to gain that type and a +1/+1 counter.)
Your opponents can't cast spells during your turn.
{W}{U}: Demigod — Until your next turn, whenever an opponent draws a card, you may draw a card.
{4}{W}{U}: God — If it isn't an extra turn, take an extra turn after this one. Untap all permanents you control at the beginning of that turn's end step.

Whenever an opponent attacks, exile Last Offer. If you do, target opponent sacrifices an attacking creature and you return another enchantment card from your graveyard to your hand.

Whenever a nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of it except it is an enchantment. (It still has its abilities, but it's not a creature or other types.)

When Lay Bare Ambitions enters, if it was cast, target opponent reveals their hand. Choose a nonland card from it. That player discards that card.
If a spell or ability an opponent controls would cause them to draw one or more cards, instead sacrifice Lay Bare Ambitions and they skip those draws.

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

At the beginning of your upkeep, target player draws a card and loses 1 life. Each other player creates a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Lazhu, Whisperflame Seer enters with your choice of a trample or +1/+1 counter on him.
Whenever a creature in Lazhu's pack deals damage to a player or planeswalker, draw a card. (Two or more creatures you control with equal power are in a pack.)

When Leads Don't Die enters, mill four cards and you gain 4 life.
At the beginning of your upkeep, you may exile X cards from your graveyard and sacrifice Leads Don't Die. When you do, return target creature card with mana value X or less from your graveyard to the battlefield.

Once each turn, when a player loses life, you may harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Each opponent loses 1 life and you gain that much life.

Whenever a non-Spirit creature you control dies, you may create a token that's a copy of that creature except the token is a Spirit in addition to its other types and has haste.

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

Enchant player
At the beginning of enchanted player's upkeep, that player loses 1 life and you gain 1 life.

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Once during each of your turns, you may cast a spell with mana value 3 or less that targets a cursed opponent or a permanent a cursed opponent controls by paying life equal to its mana value rather than its mana cost.

When Leery Sortie enters, create two 1/1 green Scout creature tokens.
{R}, Sacrifice Leery Sortie: Target creature can't block this turn.

Legacy (You may play this side of this card only from your graveyard. Exile it if it would leave the battlefield or not resolve.)
At the beginning of your end step, you may search your library for a creature card, reveal it, put it into your hand, then shuffle.

Enchant creature
As Legacy of Dawn Hill enters, choose a creature type.
Enchanted creature gets +2/+0, has first strike, and is the chosen type in addition to its other types.

Enchant creature
As Legacy of Frondpond enters, choose a creature type.
Enchanted creature gets +2/+1, has deathtouch, and is the chosen type in addition to its other types.

Enchant creature
As Legacy of Highpoint enters, choose a creature type.
Enchanted creature gets +2/+2, has flying, and is the chosen type in addition to its other types.

Flash
Enchant creature
As Legacy of Northrime enters, choose a creature type.
Enchanted creature gets +1/+4 and is the chosen type in addition to its other types.

Enchant creature
As Legacy of Siltbottom enters, choose a creature type.
Enchanted creature gets +3/+3 and is the chosen type in addition to its other types.

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

At the beginning of your end step, draw a card, then discard a card.
Whenever you cast a spell with mana value 5 or greater, if it's an instant or has flash, you may counter target spell.