Plus, if you can get something onto the battlefield, their battlefield is often lacking any real threats until the midgame, letting you go on the offensive uncontested
Blue Mana Ramp for Instants and Sorceries (Curious Homunculus, Karfell Harbinger, Unblinking Observer, Volshe Tideturner) Given how intertwined blues color identity is with instants and sorceries, Im really glad to see Wizards of the Coast dipping their toes into conditional mana dorks that can only use their mana for these types of spells
As far as big card draw spells go, this rivals some of blues best
Finally, the fact that all spells are eligible for suspension and the fact that he triggers on all turns means you can play at instant speed easily
Put another way, for every two copies of Teferi, Who Slows the Sunset, theres three copies of Arlinn, the Packs Hope