(As this Saga enters and after your draw step, add a lore counter.)

I, II -- For each player, exile up to one target non-Saga, nonland permanent that player controls until Battle at the Helvault leaves the battlefield.

III -- Create Avacyn, a legendary 8/8 white Angel creature token with flying, vigilance, and indestructible.

{T}: Add {G}.

Channel -- {1}{G}, Discard Boseiju, Who Endures: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs {1} less to activate for each legendary creature you control.

Whenever a creature enters the battlefield under your control, put a +1/+1 counter on each creature you control.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Any number of target nonland permanents you control phase out. (Treat them and anything attached to them as though they don't exist until your next turn.)

{T}: Add {W}.

Channel -- {2}{W}, Discard Eiganjo, Seat of the Empire: It deals 4 damage to target attacking or blocking creature. This ability costs {1} less to activate for each legendary creature you control.

Constellation -- Whenever Grim Guardian or another enchantment enters the battlefield under your control, each opponent loses 1 life.

Enchantment spells you cast cost {1} less to cast.

Whenever you cast an enchantment spell, you gain 1 life.

Lifelink

Enchantment spells you cast cost {1} less to cast.

Return up to three target land cards from your graveyard to your hand.

Dredge 3 (If you would draw a card, you may mill three cards instead. If you do, return this card from your graveyard to your hand.)

Flying

At the beginning of combat on your turn, each player mills three cards.

{T}: Add {C}.

{T}, Sacrifice a creature: Add {B}{B}.

Enchantment spells you cast cost {1} less to cast.

Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on Starfield Mystic.

Equipped creature gets +2/+2 and has protection from green and from white.

Whenever equipped creature deals combat damage to a player, exile up to one target creature you own, then search your library for a basic land card. Put both cards onto the battlefield under your control, then shuffle.

Equip {2}

{T}: Add {B}.

Channel -- {3}{B}, Discard Takenuma, Abandoned Mire: Mill three cards, then return a creature or planeswalker card from your graveyard to your hand. This ability costs {1} less to activate for each legendary creature you control.

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 -- Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

II -- Create a 1/1 green Saproling creature token.

III -- Domain -- Target creature you control gets +X/+X and gains trample until end of turn, where X is the number of basic land types among lands you control.

At the beginning of each combat, double the power and toughness of each creature you control until end of turn.