This is because if youre in Blue-White in Foundations , you dont really have to go out of your way to end up in a deck with a bunch of fliers
They were only printed in a few sets during the XY era, and they are no longer in new sets
Add a card like Intruder Alarm and you may be stealing a ton of creatures
This helps with quickly ramping up the number of cards in your inkwell , making it easier to play the high cost characters like Belle, Mechanic Extraordinaire, who can also be a shift target , as well as Lyle Tiberius Rourke, Crystallized Mercenary, who is not only a key damage dealer , but also pretty darn good at questing
May it help you hone your drafting game well
Never being unhappy to draw it doesnt necessarily make Manamorphose better