Cosmic Yasakani No Magatama Artifact parameters?

I'm reading that this cosmic can only be used once per team per battle. That being correct then I assume it would be pointless to get three to equip a trio of Amaterasu in the arena. Am I right in that? If that's the case what's the point in getting three?

I'm referring to there being a limit on three purchases for this artifact in store. Couldn't we just move the one around in battles since we can really only play one battle at a time?

Much similar to the Book of Soyga, it's a one time use ability that grants a powerful buff to whoever wears it while debuffing enemies. It can only trigger once on your side of the battle, so yeah it would be pointless to use three on a team. Instead, use one.

Thanks for that clarification. Much appreciated.