I still remember when Jwari Shapeshifter was previewed and thinking, "Now, there's a card that I want to play in Limited Allies." (I would go on to draft the most ridiculous Ally mill deck in my Magic career
With enough mana rocks to generate three or more mana, you can untap them for infinite mana, generate an infinite storm count and easily win through Reservoir or Urza, Lord High Artificer
Whether Ravensburger severely underestimated the popularity of the game, or the scarcity is an intentional marketing tool, I dont know, but as a new player or someone trying to get into the game, you may not be able to find any product to buy for a while
Now, onto the design
Some cards that are big names in the format are more expensive than Standard or Modern heavy hitters
Most Expensive Magic Zendikar Rising card list & price guide