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It's really good against the item lock that you find in abilities, like Vileplume and Trevenant (XY 55/146)

In a deck with synergies the card is a combo kill machine

[L][C][C][C] Amp You Very Much: 120 damage

If you have multiples of Dragoons Lance and Red Mages Rapier (by far the most powerful of the equipment cards in terms of pressuring life totals early) and copies of Suplex or Slash of Light to force through those attacks, you can go all-in with finishers like Unexpected Request and Zidane, Tantalus Thief to steal games before the opponent gets going

Maybe you can just thwack an opponent with ViviVivi's staff and get home in time to collect the Excalibur II before it disappears into the ether in twelve hours