it works.. u just need to bring the right unit for it to activate.. for example if u want to use x1000 dmg then u need to bring unit that has attack buff to party or self..
as for def it'll active eventho there's no buff..
as for 100% evade.. u dont need any buff like def.. but it can be countered by unit that has determinative hit skill.. it means the skill wont ever miss.. (unless the unit have red shield[ignore damage shield])
as for the gold.. i dunno how to activate it.. dunno if it's broken or nope.. well.. that's all i guess..
[NOTE : if the atk buff is gone then the mod dmg will be gone too..]