1 - Sylvan Tutor Green decks already have powerful tutors with Chord of Calling, Archdruid's Charm and even Natural Order to cheat on mana costs, and now, Sylvan Tutor joins this wide range to search for any creature for just one mana
Class is a returning enchantment type
Many of these decks may include win conditions in the form of cards with storm, an ability that copies a given spell for each other spell cast before it in a turn
Devoid Eldrazi Graveyard Recursion Again not a whole lot here to talk about, but Artisan of Kozilek is very good, and we have a powerful tribal recursion with Patriarch's Bidding
Vodalian Hexcatcher slots perfectly into decks led by older merfolk commanders such as Sygg, River Guide and Kumena, Tyrant of Orazca or the new Emperor Mihail II featured in the run of auxiliary Commander cards in Dominaria United Set and Collector Boosters
Rhystic Study Commander is a multiplayer format where it is usually played by at least four players, so a full turn with this enchantment out would get you at least three cards