While there is some variance (super-low-curve aggressive decks might have slightly less, while decks built on ramping or other land synergies might have slightly more), probably 80% of all the Commander decks I build have 37 lands
Perfect for Commander, cEDH & Beyond Mystical Tutor is one of the most sought-after cards in Commander and cEDH
Speaking from the uninformed perspective of someone who's never opened an Unfinity pack, the set looks like it would be fun the first time you tried it, and then never again (outside of an Attraction Commander deck, which admittedly sounds like a laugh)
Their goal was to make sure every game had at least 10 cards and at least one of rare quality, to make sure fans could find some representation from their favorite games
Overall a somewhat lack lustre card that gets a job done cheap if not always as well as you might like
It doubles up your triggered abilities whenever a creature or enchantment enters under your control