Whenever High Perfect Morcant or another Elf you control enters, each opponent blights 1. (They each put a -1/-1 counter on a creature they control.)
Tap three untapped Elves you control: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.)
I, II — Look at the top seven cards of your library. You may reveal a non-Saga permanent card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
III — Put up to two non-Saga permanent cards from your hand onto the battlefield.

Prevent all combat damage that would be dealt by target creature this turn.
Cycling (, Discard this card: Draw a card.)

This creature can't block.
You may cast this card from your graveyard as long as you control a Zombie.

Whenever a creature dies, you may have this enchantment deal damage to target player equal to the number of cards in that player's hand.

Commander spells you cast have cascade. (Whenever you cast a commander, exile cards from the top of your library until you exile a nonland card with lesser mana value. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Destroy all creatures.
II — Mill four cards. When you do, return target creature card from your graveyard to your hand.
III — Whenever a creature you control attacks alone this turn, put three +1/+1 counters on it. It gains trample, lifelink, and indestructible until end of turn.

: Add for each Elf on the battlefield.

: Add .
, Sacrifice this land: Return target land card from your graveyard to your hand.

Whenever one or more creatures you control with mana value 3 or less enter, draw a card. This ability triggers only once each turn.

Destroy target artifact or enchantment.

When this creature enters, you may destroy target artifact or enchantment.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Exile target creature. Its controller gains life equal to its power.

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Tandem Lookout is paired with another creature, each of those creatures has "Whenever this creature deals damage to an opponent, draw a card."

Flying
Whenever Weatherlight deals combat damage to a player, look at the top five cards of your library. You may reveal a historic card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. (Artifacts, legendaries, and Sagas are historic.)
Crew 3

Char deals 4 damage to any target and 2 damage to you.

Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Lathril deals combat damage to a player, create that many 1/1 green Elf Warrior creature tokens.
, Tap ten untapped Elves you control: Each opponent loses 10 life and you gain 10 life.