In my article last week I opened with a brew for a U/R Prowess deck that took advantage of the printing of Stormchaser Mage, Slip Through Space, and Expedite to form a cohesive tempo shell in the vein of the U/W Delver deck from years past
The online version was sold as a 2-pack via the queue system
Therefor I think 4 is definitely not the correct answer and I often keep it to 2
Also, it's a shuffle effect for things like Brainstorm, Sensei's Divining Top and Scroll Rack
For players who are interested in exploring Energy, Quest Counters, Voltron, Rad Counters/Proliferate, mill and Aristocrat synergies, theres a lot of cool tools in the MTG Fallout Commander decks
Also a shout out to One with the Multiverse that combined Future Sight with Omniscience sort of with one spell cast each of your turns