The reward of damage, lifegain, and card advantage makes this a surprisingly impactful black creature
An effective manabase can't contain only taplands, but there's always room for a few, and the utility on Bojuka Bog makes it well worth being one of them
Sans Red decks often win through combo or overwhelming card advantage rather than combat damage
Thats sweet, but dont forget that card draw
Thankfully, an experienced gumshoe like you knows exactly where to look: Collector Boosters
If all you want is to find one card you can find it but the Vault offers something more by letting you preview what cards would come along with it, allowing players to plot out the next several turns of the game and see if the sequence being offered would get it done