Higher grades, especially 9 or 10, can significantly increase a cards value
Starting with a deck you already enjoy, and making it able to consistently cast all of its spells on-curve, is truly blissful
It offers powerful advantages, but it still requires some level of external support
However, they require multiple Energy types to use their attacks, which make them highly inconsistent when Energy generation is randomized and thus require the entire deck to revolve around them or to have some other utility that does not involve attacking, such as "Druddigon" ( Mythical Island )
Blade of the Bloodchief While a number of creature-type focused equipment exist, Blade of the Bloodchief stands out amongst the crowd by virtue of being one of the quickest possible ways to put a ton of +1/+1 counters on the field