Since green is here you can dodge a lot of the more powerful blue game changers by adding a few cards that let you draw cards when you have creatures come into play
Another one of blues strengths is obviously the ability to draw many, many cards, which makes the extra turn strategy come together rapidly, considering that you will see much more of your deck than other players might
Lets face it, banding and taxing artifact activations (by requiring them to pay a white mana assuming they had access to white) wasnt all that earth-shattering
Besides the obvious synergy with Toothy, Imaginary Friends +1/+1 counters and card draw, Pir can really increase the effectiveness of planeswalkers, oil counters, and vanishing creatures
Each one is beneficial in its own way and either requires certain conditions to be met or gives you instructions on what you can do when the card is played