Given how cheap the initial cost is and the big impact it has, leveling up this enchantment doesn't need to be a priority, but if you have a few creatures on the battlefield and want to let your hand build back up, you can focus on pumping mana into upgrades
Stay with Me (Rhystic Study) $246 Oh, gee I wonder what happens when you take one of the stapliest staples that ever stapled in Commander, make it a mythic rare, slap it onto a bonus sheet of Magic's best-selling set ever , and illustrate it with the two Final Fantasy characters that WotC is determined to turn into I'm not crying, you're crying! moments
Some Charizard ex decks already use this card to grab Duskulls, Pidgeys, and a Rotom V for an instant setup on the first turn
When you drop it, it alllows you to move energy around however you like, which can be very effective