By lowering the cost of each of these tutors by , having them only focus on a specific card type, and having them place the card on top of your library instead of into your hand, these one-mana instants were meant to be more balanced versions of the original tutor
This reminds me of Kona, Rescue Beastie in terms of the risk/reward involved, but a little bit weaker overall
Draft and sealed force you to work with whatever colors you open, teaching flexibility
Adventures can spice up many archetypes in MTG, but Beluna can consolidate them into a functioning, powerful deck of their own
The longer you can wait to tell your opponent something, the more opportunity there is for them to make a play they wouldn't have made if you had played that card earlier