History Teacher — Sagas you control have read ahead. (As a Saga enters the battlefield, choose a chapter and start with that many lore counters. Skipped chapters don't trigger.) Doctor's companion (You can have two commanders if the other is the Doctor.)

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.)

Science Teacher — Each Saga spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast that Saga, copy it for each time you paid its replicate cost. Copies of permanents enter the battlefield as tokens.) Doctor's companion (You can have two commanders if the other is the Doctor.)

Lifelink Whenever you sacrifice an enchantment, draw a card. Whenever the final chapter ability of a Saga you control resolves, each opponent loses X life and you gain X life, where X is that Saga's mana value.

{T}: Put a lore counter on each Saga you control. Activate only as a sorcery. When Satsuki, the Living Lore dies, choose up to one — • Return target Saga or enchantment creature you control to its owner's hand. • Return target Saga card from your graveyard to your hand.

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

Whenever Historian's Boon or another nontoken enchantment enters the battlefield under your control, create a 1/1 white Soldier creature token. Whenever the final chapter ability of a Saga you control triggers, create a 4/4 white Angel creature token with flying and vigilance.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Each player gets three rad counters. II — Create X 2/2 black Zombie Mutant creature tokens, where X is the total number of rad counters among players. III — Put two +1/+1 counters on each creature you control that's a Zombie or Mutant.