Mistpiercer is the 20th most-used weapon under the current filters (1.4% of 524,249 recorded fights), winning 57.3% overall - 9.9% of its wins come against better-geared opponents.
Best against Great Holy Staff (96.9%), Fallen Staff (96.8%), Nature Staff (96.8%). Struggles against Demonfang (20.0%), Twin Slayers (25.0%), Crystal Reaper (26.8%).
Winrate by IP difference (50-IP buckets, dot size = sample size). A flat curve means the weapon carries regardless of gear; a steep one means it only wins when out-gearing.