Many of these cards especially the best colorless creatures MTG like Wurmcoil Engine also have a triggered ability that goes off when they enter the field or when a certain event happens, which can add layers of strategy to your turns
Using cards to buff it will buff every creature you cast while its on the field just as much, allowing you to go wide without sacrificing power
Farmer Maggot, Hobbit of the Marish (11U163) or Fredegar Bolger, Fatty (18R107) are popular choices
If your mono-blue deck doesnt use many instants, sorceries, or artifacts, your options for tutors are going to be very limited
Which sleeves do I use for grading submission
Still, these options offer plenty of potential for exciting mechanical effects, and there's one new addition in particular that I can see being very popular in both Standard and Commander