They are how most players first interact with a new set, and they remain the most popular way to build a collection, open cards for fun, and play limited formats like draft and sealed
First off, a set booster is a 12-card pack meant to be cracked, not drafted, and they dont have to be color or rarity-balanced
While The Ur-Dragon is in the command zone or in play, Dragon spells you cast cost one less generic mana to play
Unfortunately, a lot of those products seem to have been discontinued as there is no where to buy them online
Even so, this still looks pretty good compared to Azorius Charm for control decks
Passage costs more in terms of life, but its also more consistent, since you dont need to have a basic in your deck to fetch up