Your 🔥ed. Sphere kuriboh still is and will be a good card because of its ability from your hand. While Econ has more chances to be negated, sphere kuriboh can only be negated by cards such as champions vigilance or divine wrath which could still hurt an opponent of a backup Econ is set. It’s not too old to be useless. You’re probably just grumpy you’ve got 🔥 cards
There's such a thing as not wasting a ton of gems and time on something that's super hard to get. And, if you lose because your E Con is negated, what of it? You'll win again eventually.