Even when splashing for blue, blue presence in a deck is all about the instants, especially for card draw (or so-called cantrips)
This card costs X and three green, has Convoke - meaning you can tap creatures to help you pay for the cost - and you can search your library for a creature that costs X or less and put it into play at instant speed
Blue cards are centered around the mental side of battle knowledge, control, manipulation, and foresight
These are incredible pieces of art that expand the images the characters are seen in, within the main cards
I'd say at least five, and on a D20 the odds of getting five or more are very good
Wondering about the secrets of crafting a winning Pokmon deck