Infernal Staff is the 67th most-used weapon under the current filters (0.5% of 487,802 recorded fights), winning 51.0% overall - 8.0% of its wins come against better-geared opponents.
Best against Holy Staff (78.4%), Cursed Staff (75.9%), Dual Swords (68.4%). Struggles against Arclight Blasters (25.0%), Frost Staff (34.3%), Heavy Crossbow (34.7%).
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.