This means that Teferi generally gets more powerful at twice the normal speed of any other planeswalker, letting you take extra turns far more frequently than is generally considered polite
Fortify only as a sorcery
And goodness knows that most games of Magic don't involve morph anyway, so Break Open has absolutely no effect whatsoever
This can trade with things that have as much as 4 toughness and hit pretty hard when you want it to
If we can keep Teferi off the board, Didn't Say Please and Thought Collapse allow us to play a weird control-mill game, where we try to stick a copy or two of Drowned Secrets, always leave up a counterspell for whatever threat our opponent might have (while hopefully using the rest of our mana to cast cheap mill cards during our turn), and slowly mill away our opponent's library as we counter their threats
This stax piece is incredibly potent in EDH thanks to the prevalence of card draw and spells that search the battlefield