I suspect the absence of a guaranteed rare in Value boosters is, in part, specifically supposed to deter collectors, so that these boosters stay in stock for kids to buy
They do, however, all appear to have the same font
For the set's full card list, check out the official MTG blog
Bane Alley Broker even comes with the ability to get back the lost cards
That last ability lets you pull a 0-cost artifact like Mox Amber from the graveyard by saccing an artifact token
Some of the cards that are good for your deck, like Sanctum Gargoyle, Executioners Capsule, and the Spellbombs, are good in other decks, so the most likely way to end up in Affinity is to just backdoor into it after picking up a few of these and noticing quality artifacts going late