This turns into an infinite combo if you have any of Red's umpteen haste enablers, as you can then reuse the extra turn ability as many times as you like
Here are the most effective ways to play around discard strategies: Draw a bunch of cards consistently, which is unfortunately something that some colors struggle to do (blue card draw and green card draw tend to be the best)
First, they help make sure we can reuse our mill creatures by bouncing them back to our hand, which gives us another Manic Scribe trigger and more energy to keep activating Minister of Inquiries
No Infinite Combos Similar to the land destruction rule, a lot of groups find infinite combos annoying, boring, or otherwise unfun to play against
Its the kind of feel-good format preservation players are always begging for, and Wizards even acknowledged The Professors tireless campaign for a reprint by giving it to him as a preview card
Sounds boring