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
If you have Academy Manufactor on the field, then you also create a Treasure Token and a Food Token every time you investigate, leading to endless ETBs, endless LTBs, endless Clue, Treasure, and Food Tokens, infinite lifegain, infinite card draw, infinite draw triggers, and infinite mana
While most playgroups are okay with blowing up mana rocks, many playgroups are not okay with you messing lands
Bloomburrow: Heartfire Hero Runner-Up: Fountainport There are a plethora of amazing cards in Bloomburrow