General idea on how to run a Shark XYZ deck
You want to get as many Bahamut Shark and Toadally Awesome on your field on first turn as possible.
You can also bring out a one-time Zeus.
Not really suitable for long duel, but Toadally and Lifeless Shark can help recover some resources.
The amount of monsters each/other engine monster can be changed depend on person, i just introduce a basic one.