1 Azorius Guildgate
Whenever chaos ensues, return target permanent card from your graveyard to the battlefield
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")
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
Vivien lets the player play creatures as if they had Flash, which includes ones that can be played from exile, giving the player a wider pool of monsters to surprise the player with, while her +1 ability grants Reach and Vigilance to one creature until the next turn, providing a much-needed counter to flyers