A bit of research will also allow you to more or less standardize the price of each bulk set
Whether you pop a different Legendary Creature in your command zone or repurpose your cards into a totally custom deck, the set provides enough versatility to have each round go a little differently every time
Shagrat, Loot Bearer FromTheShire: I can't recall ever seeing a Rakdos Equipment deck, so getting something to effectively support a new archetype is really cool
When your opponent draws a card, they must pay mana or you can get a treasure token
As Specialists lets you choose a creature type, it is just efficient in general and fits decks that focus on Zombies, Demons, Humans, Angels, Clerics, and many others