Read aheadRead ahead is a keyword found on some Saga cards. “Read ahead” means “Chapter abilities of this Saga can’t trigger the turn it entered the battlefield unless it has exactly the number of lore counters on it specified in the chapter symbol of that ability.” See rule 714, “Saga Cards.”
Each Saga with read ahead has the intrinsic abilities “As this Saga enters, choose a number between one and this Saga’s final chapter number” and “This Saga enters with the chosen number of lore counters on it.” See rule 714.3b.
Multiple instances of read ahead on the same object are redundant. (CR 702.155) (Choose a chapter and start with that many lore
countersTo counter a spell or ability is to cancel it: remove it from the stack without resolving it. A counter on an object or player is instead a marker that changes characteristics or interacts with rules or abilities; for example, a +1/+1 counter modifies a creature’s power and toughness. (CR 701.6; 122.1). Add one after your draw step. Skipped chapters don't trigger.
SacrificeTo sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect this action. (CR 701.21) after III.)
I — You may
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost.
II — Target player mills four cards.
III —
ExileTo exile an object, move it to the exile zone from wherever it is. See rule 406, “Exile.” (CR 701.13) target instant or sorcery card from your graveyard. Copy it. You may
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) the copy.