For a better explanation of why this is true, read this article on the topic, which I read after writing all of my code and showed me that my method was overly complex
Sometimes, youll focus heavily on your lands and get a huge mana discount on spells
Fighting Energy, the other of the two rarest, still features in the starter deck and in one theme deck
Ancient Tomb: Ancient Tomb is one of the most powerful and sought-after lands in the entire game, a cornerstone of competitive formats like Legacy and high-power Commander
Sure, they might be able to chip away at your equipment and auras with removal, but if you make the commander itself hexproof, all they can do is take off one piece just for you to tack on another
Is this mechanic inherently broken, or do we just need to change how cards are using it