And I think this is an appropriate place to end this piece
The most notable of these is Monastery Mentor, who not only has Prowess it will also spit out a token with Prowess any time you cast a non-creature spell
The ability to tap this creature, pay two mana and nine life into an Expropriate (the first example we can think of right off the bat, forgive us!), and then still have mana for other spells is absolutely massive , and honestly, while we are definitely going to play it, we dread seeing it cast on an opposing turn while free of removal spells to deal with it before it can be used even once
Fighting & Psychic, Water & Fire, and Grass & Lightning
While they do get bounced to your hand, in most Blue-White decks thats way better than having them go to the graveyard