Your instant speed card draw and counterspells mean you beat the other late game trump decks, and the fact that your late game is less absurdly over the top means youre better against the decks that are trying to go under you
That already existed on a three-drop 1/3 with double strike printed years ago called Prophetic Flamespeaker that dominated tables
While blue and red have some powerful enchantments, Abzan is the perfect home for enchantress decks in general, but it also gives you access to all the best constellation cards
Do you want Simic colors and a merfolk in your command zone, or do you want Dimir and a vampire-kraken
These all give you access to powerful removal, counterspell, and protection, something very much appreciated in a deck like Calvary Charge that wants a lot of creatures on the battlefield on your side and little on your opponents'
Any rock that taps for two or more and either a Pili-pala or a Staff of domination, boom