Grailseeker is the 30th most-used weapon under the current filters (1.0% of 441,426 recorded fights), winning 51.8% overall - 13.0% of its wins come against better-geared opponents.
Best against Druidic Staff (96.9%), Great Nature Staff (89.3%), Lifetouch Staff (85.7%). Struggles against Arclight Blasters (7.7%), Crystal Reaper (14.8%), Demonic Staff (17.9%).
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.
