For many, this is a fond throwback to their childhood, utilizing the original set of Pocket Monsters in updated TCG artwork
Creatures like Piper of the Swarm, Totentanz, Swarm Piper, and Ogre Slumlord can ensure your field is consistently full of rats, and the nonlegendary Piper even lets you use them to steal your opponents creatures
The fact that Ragavan, Nimble Pilferer only does its thing once it connects, makes it fundamentally more fair and balanced than Deathrite Shaman will ever be
Enchanted cards are numbered above the official number of cards in a set
Whenever one or more creatures you control deal combat damage to one or more players, proliferate
Three-color limited environments need quite a bit of mana fixing, at all rarities explains Wizards of the Coast Senior Game Designer Adam Prosak