For example, it's uncastable if no players control an enchantment
Sting is a great Flash artifact that is best played when your opponent's board is stacked with tapped creatures, but with a two-mana cost and a three-mana attach fee, it really could do with something else, like granting First Strike, to be a lock for competitive play
I somewhat feel like that pushes the card into the realms of narrow
Getting to copy your Creature spells is very strong, and in a multiplayer Commander game, you can use Demonstrate for political gain
Mendicant Core, Guidelight
The Ozolith The Ozolith is a powerful legendary Artifact thats able to retrieve counters off creatures that die and place them on another target creature