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(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I — Create a 1/1 white Mouse creature token.
II, III — Create a token that's a copy of target token you control.
IV — Creatures you control get +1/+1 and gain vigilance until end of turn.
If the copied token is copying something else, then the token enters the battlefield as whatever that token copied.
Only creatures you control at the time the fourth chapter ability resolves will get +1/+1 and gain vigilance. Creatures you begin to control later in the turn won't be affected.
The token copies the original characteristics of the target token as stated by the effect that created the token.
