As a historic permanent enters the battlefield under your control, it becomes a 7/7 Dinosaur creature in addition to its other types. (Artifacts, legendaries, and Sagas are historic.)

When Displacer Beast enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.)

Displacement — : Return Displacer Beast to its owner's hand.

Devoid (This card has no color.)

: Exile another target creature, then return it to the battlefield tapped under its owner's control. ( represents colorless mana.)

Haste

At the beginning of your upkeep, return a red creature you control to its owner's hand.

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

I — Create a 1/1 white Human Noble creature token with vanishing 3 and "Prevent all damage that would be dealt to this creature."

II — Create a 2/2 white Horse creature token with "Doctors you control have horsemanship." (They can't be blocked except by creatures with horsemanship.)

III — Whenever a creature you control deals combat damage to a player this turn, time travel.