Thats about all the subtlety you can find here
While useless early on, later in the game it can fetch you exactly the card that you need, and for only two mana
That alone is pretty powerful, but I would say it is even more relevant for the fighting types than others, as they typically require a ton of energy in order to execute their attacks
Many cards break into the 3-figures if they're not printed enough, like Power Artifact, and its not uncommon to get into 4, 5, and even 6-figure price ranges for the ultra-rare
Their extra length creates challenges for safe storage because standard oversized sleeves remain too small
Links and References This is the first time I feel the need to include links to rulings, only because the rules are such an important part of this CotD