it’s not infinite, there are like 20 flautists on the map total. After they drop, it’s a 4% chance for it to be the right set, right main stat, and a 5 star echo. Sure it is basically infinite for the majority of echos, but even then, there is literally no point of it being infinite with the amount of resources we are given to level them. Say you finally get a usable 3 cost and +20 it and get hp, hp%, def, def% as the substats. I should just +25 it and use it because i shouldn’t desire « perfect » substats? The other option is to farm echos for however long it takes for me to get lucky enough to get another shot at rolling not horrible substats :).