You can even force an opponent to discard by paying some mana and tapping it, which is probably the better part of this card
Imprisoned in the Moon is a cheap and effective way, 2B, to slow down the opponent, for example, to get their Commander out of the game for some time
In a Vintage environment, its trivial to get a three-mana colorless Planeswalker into play ahead of schedule with Moxen and other broken artifacts
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
You know you have nothing better to do