Miracle Worker

The targeting clause is the entire design: this Cleric destroys Auras, but only ones sitting on creatures you control, and only by tapping its own 1/1 body to do it. Most enchantment removal of the period would destroy an Aura wherever it sat; here the answer is deliberately walled off to a single use case. The threat model it was built against is opponents weaponizing Auras against your own board: curses and parasitic enchantments that turned your creatures into liabilities. Strip the offending Aura off your guy, untap, and the Cleric stands ready to do it again. The problem is that hostile Auras on your own creatures were always a fringe interaction, and tasking a fragile body that has to survive and tap with clearing one of them is a steep price for a problem you could usually ignore. The card belongs to a design discipline Magic spent years unlearning: the hyper-specific white utility creature, printed as insurance against an interaction the format rarely produced. Later versions of the "destroy an Aura" effect widened the targeting and dropped the body, because the value was never in restricting whose Aura you were allowed to touch.