This and Dovin's Veto will make all blue-white control players change their typical strategies in mirror match-ups.
Teferi will also be good against Ad Nauseam and Storm decks that rely heavily on instant spells, which will be useful only as sorceries.
His plus ability will let you cast board clears like Damnation and Wrath of God at instant speed.
On top of that you can use discard spells like Thoughtsieze and Inquisition of Kozilek in Esper Control for disrupting an opponent's hand at their draw step.
The minus ability removes anything that prevents you from doing your job, or it could return to your hand something you would want to replay.
All this makes Teferi, Time Raveler one of the best new planeswalkers for Modern format.