Sarkhan, the Dragonspeaker Sarkhan Vol is my favorite planeswalker because his character is sweet and because he interacts with your opponent in multiple ways
Thus, when you have competitive staples that make unique tokens, you end up with sets like Dragons Maze, which was so underpowered, underdeveloped and generally unpopular that the most expensive card in the set was Voice of Resurgence, followed closely by its respective token
When it comes to creatures, spells, and land, Wizards has years of experience and data to figure out what the right baseline power level is, and as we just talked about, they tend to aim far enough to the "safe" side that even if they miss, the result is a very good card (like Collected Company), rather than a ban-worthy monster
For most people, change, even positive change, is difficult to deal with
You can learn valuable lessons in deck construction by studying top-tier Pokmon TCG Pocket decks and applying those concepts to your game
It's abilities work well together and are relatively inexpensive to get onto the field