Li Shenron
Legend
In this most recent playtest, the wizard cast it nearly every single round. Eventually, after about the fifteenth time he cast the spell, he told the DM to "just assume I am casting Detect Magic constantly, over and over again, unless I call another action." She responded, "Okay, but you will be muttering incantations and waving your hands around the entire time, which will make hiding and sneaking difficult." He decided to back down, and went back to just casting the spell at every whim.
Very good call.