You want to be able to cast a spell or two every turn, and having too many expensive cards will stop you doing that
Illustrated by Adam Rex Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Not Legal Brawl Legal Legacy Legal Comp
However, with cards like Hedron-Field Purists and Hada Spy Patrol, being able to pay one mana to level up rather than three is very powerful, helping us get to the highest level in just one or two turns
The idea that imperfections can be valuable, that something "wrong" can be more interesting than something "right," resonated with us when we were building a marketplace for the card community
Curse of the Swine Curse of the Swine gives blue decks a unique means of dealing with multiple creatures at once
Its two-for-one, which is great