Lavinias not as powerful at lower-powered tables where you wont encounter these strategies
One is to OTK comboed with "Numeron Calling," and the other is to set up "Number S0: Utopic ZEXAL." The Field Spell allows "Numeron" effects to be used without detaching Xyz Materials, which can very quickly defeat the opponent in one Turn
Winner (Japanese) (2009) This Arceus card design was one of the 2009 CoroCoro Ichiban
(Though Ozai, the Phoenix King does this even better, allowing you to keep the excess mana.) Miirym, Sentinel Wyrm is solid, but only in green-blue-red dragon decks and nowhere else, so that's a tad limiting
Once your cards are in this shell case, it will be much safer to store
Where should I buy early Japanese Pokmon cards