While they haven't revealed what those are, it is fair to hope for something from the X-Men, The Avengers, and more
Forgotten Cellar is fine as a more expensive Yawgmoths Will, but I see players leaning into Walk-In Closet heavily within decks that utilize the graveyard and want to Ramp
Five mana for a rock that produces WUBRG is pretty cheap, and youd end up paying more for it to enter untapped (though how much more, when Chromatic Orrery is seven mana, Im not sure)
So the policy was defined to update the creature card type whenever the card was reprinted. The Grand Creature Type Update Wizards published the Grand Creature Type update in 2007 to inform and update players on the criteria and considerations to define the new creature types on MTG cards
From my playtesting, I've seen this deck easily outperform upgraded precons from other sets , so putting it in Bracket One, while technically legal, feels deceptive