The Adventures in the Forgotten Realms Set Booster Pack contains 12 Magic cards, 1 Art Card (includes a D&D monster stat block on the back in 33% of packs), and 1 token, ad card, or special card from Magic's history (a card from "The List")
One of these cards goes to your graveyard by default
Magic's lore involves titanic creatures including Krakens, Dragons, Dinosaurs, Eldrazi, and much more, so there's no shortage of contestants for the card with the highest toughness
Having a creature with Reach is one thing, but having one that grows repeatedly is another
So the deck is about Noncreature spells, and the commanders care a bit more about High Mana Value but it's not a main focus of the deck, and there's a bunch of minor cute subthemes that play off our main theme and commander