Beyond the enchantment value engines a number of the best creatures are enchantment creatures: Overlords, Fear of Missing Out, Kumano, Fable
Enclave Cryptologists and Cryptbreaker are seemingly a lot cheaper than a Pack Rat at only 3 mana to play and activate for your discard
I think the Mountain is my favorite
This common seems silly and is totally not worth your time if youre not playing self-mill win conditions
Each of these has a place in Standard, whether it is in the main deck or your sideboard, youre going to want some counterspells if youre playing Blue Right now, while aggressive decks dominate early cycles and low costed creatures run free, Essence Scatter and Syncopate perform the best
Learn more about Magic: The Gathering at its official website