COMPETITIVE SHARK DECK 2020 MR5

You could possibly substitute Evilswarm for something else since you don't really want to wipe off all of your Xyz off the board.

 

1.) Chain for Bahamut Shark to activate it's effect and either special summon Number 71 to chain for Blackray Lancer or special summon Toadally.

2.) Keep Xyz summoning until you have 3 or 4 and link summon Infinitrack. Activate Infinitrack's effect and special summon 1 xyz from the GY once per turn. Infinitrack is also a really great beat stick.

 

Note: If you want lots of Xyz monsters on the field special summon Xyz Remora. ;)