If you have other ways of creating Clues in your deck, just watch how quickly Thorough Investigation gets out of hand
I suspect that after #2 below, this is going to be the most played leader in the set for Commander
3: Look at the top seven cards of your library
Like most Magic: The Gathering cards, the value of Scroll Rack depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Kaladesh Inventions)
You also get to pick the cards, where Fact or Fiction allows the opponent to choose
Indestructible blanks a lot of the most popular removal and board wipes out there, which means your opponents will usually have to work a bit if they want it gone for a turn