Chronomaly " Chronomaly " , known as " OOPArts " ( " Ōpātsu " or 오파츠 " Opacheu " ) in Japan or Korea , is an archetype of monsters used by Trey in the " Yu - Gi - Oh ! ZEXAL " anime . Most are either EARTH or LIGHT , as well as either Machine or Rock . Their effects support each other well , enabling quick swarm ing and Xyz Summon s of Rank 5 Xyz Monster s , particularly through the LIGHT monsters . Design . Appearance . Most " Chronomaly " monsters are based on and resemble various artifacts . Etymology . The " OCG " name , " OOPArts " , is an acronym for " " , a term used to describe artifacts that make no logical sense given the technology available at the time they were created . Such objects were also featured as part of the " Ancient Treasure " series in the " Yu - Gi - Oh ! 5D ' s " anime . The " TCG " name , " Chronomaly " , is a portmanteau of the word " chronology " which is the sequential order in which past events occur and " anomaly " as in an irregularity or something odd . Put together these monsters are " chronological anomalies " or " chronomalies " since these objects deviate from what would have been possible to create given the resources and technology available at that time . Playing style . " Chronomaly " monsters are focused on Xyz Summon ing a wide range of Xyz Monster s . Many of their effects allow Special Summon ing of more " Chronomaly " monsters . Chronomaly OTK . This Deck focuses on using the effects of " " and " " to perform a One Turn Kill . What you need : How it works : 1800 ( the first effect of " Chronomaly Machu Mech " ) + 4200 ( the ATK of " Chronomaly Machu Mech " ) + 2000 ( the ATK of " Chronomaly Chateau Huyuk " ) = 8000 damage Notes : Weaknesses . Since most " Chronomaly " cards involve swarming , mass - removal cards like " Dark Hole " , " Torrential Tribute " and " Deck Devastation Virus " can interdict " Chronomaly " monsters before they have a chance to infest the field with the latter - most aforementioned card perhaps being the deadliest to this Deck due to the card ' s lingering effect and all the non - Xyz " Chronomaly " monsters ( except " Winged Sphinx " ) sporting 1500 or less ATK . " Light - Imprisoning Mirror " also poses a threat to their swarming and effects , as most " Chronomaly " monsters have LIGHT as their Attribute . However , " Mind Drain " can be worse in countering their Special Summon ing as a lot of key Level 5 " Chronomaly " monsters ( i . e . " Moai " and " Moai Carrier " ) are helpful in Xyz Summoning " " . In addition , cards like " Summon Limit " , " Narrow Pass " and any cards that render Monster Card Zone s useless ( i . e . " Ground Collapse " ) can bar them from the field completely ( " Summon Breaker " can also flat - out pause a spamming " Chronomaly " player ' s turn completely ) . In fact , these countermeasures , combined with anti - Special Summoning support , can almost completely shut down " Chronomaly " Decks . Finally , most " Chronomaly " monsters have scanty DEF — if " Chronomaly " Duelists go on the defensive , Defense Position - destroying card effects and piercing cards can be added boon against " Chronomaly " Decks . If you want to go on the defensive use " Giant Soldier of Steel " in your Extra Deck against burns and monsters with 1900 or more ATK .