Abyss rising give two of most needed Xyz monsters those are Bahamut Shark and One-Eyed Skill Gainer the first is rank 4 water monster with a high attack and huge effect of summoning rank 3 Xyz monster from extra deck which first of its kind represnting that type of effect for example you can special summon Number 17: Leviathan Dragon with 2000 attack and add overly unit to it by overly eater 

Moving on to One-Eyed Skill Gainer an Xyz monster give the ability of copying the effect of other Xyz monster on field taking its name and orignal effect to its side knowing it need 3 level 4 monsters to summon you may need a swarming field deck to get them in one turn and detach on overlay to copy utopia and use the other 2 overlays to negate high attack from attacking