The fantasy of Blue is that they're the smartest magician, and so they can find loopholes in all magical spells and they are able to chant the exact counter-magic to stop Black from resurrecting the dead or for Red to cast their lightning bolts
The reserved list still applies to many of these cards, which drove people to massively park money in a lot of this in 2016-2017, but theres hundreds of thousands of copies of each of these cards out there, at least
Zacama, Primal Calamity CMC: 9(RGW) Type: Legendary Creature Elder Dinosaur Stats: 9/9 Keyword: Vigilance, Reach, Trample First ability: When Zacama, Primal Calamity enters the battlefield, if you cast it, untap all lands you control
Pikachus cheeks are supposed to turn yellow when generating electrical current
the Anowon deck is going to need a lot less, since its curve is much lower, but youll still want to make sure you can hit your land drops so you can cast counterspells
If youre building towards affinity, you need to draw a bunch of artifacts
