Pros: Easy to understand strategy
And while Aboshan, Cephalid Emperor is an explicit way of using your octopus creatures to tap your opponents creatures, I dont find it as strong as some of the batched sea creature support
It had its ups and downs since then, including a top 4 finish at Worlds, but recently, it seems that a consensus has finally been reached that its a strong deck, maybe the best in the format, after the two most recent Regionals, in Portland in Charlotte, were won by Giratina VSTAR, in the hands of Jon Eng and Vini Fernandez respectively
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on
As of Xyz Monsters, both of the newer Xyz Monster need that 1 copy of Heraldry Crest in the Extra Deck