Their owner doesn't get to know what they are while they're in exile until you play them
Booster boxes are especially good value when: You have a full pod You want prize packs Everyone is splitting the cost Your group enjoys opening sealed product You want a social event rather than just individual pack opening Buying singles is better when you need specific cards for Commander, Standard, Modern, or another constructed deck
Sun Titans been showing its age (its also in the deck, by the way), and Angel of Indemnity feels like the next evolution of that type of card
So you can cast Stomp for one generic and one red, and then cast Bonecrusher Giant from exile by paying two generic and one red
And then not much...but now in Standard right now we've got a better version with ward 2 called disguise cloaking is a better manifest from Murders and we just got manifest dread in Duskmourn
Totally up to the tastes of the buyer