Change your preferences here.
Increases the power of all of the holder's damage-dealing Ghost-type attacks by 20%.
Spell Tag isn't bad, but it isn't that good either. While a 20% boost to Ghost-type attacks is decent, it's not quite as excellent as the 30% boost to all attacks that you get from Life Orb. If you don't like Life Orb's recoil damage, or want to try to bluff a Choice item, then Expert Belt is typically a better overall choice for its added damage to all super effective attacks. Even if you are running a mono-attacking set with Ghost coverage (not recommended), either Leftovers or Life Orb would probably be better for your purposes, depending on your build.
Celestial Tower, 3F.
Wild Yamask and Cofagrigus (5%).