Use Fire King Island to destroy Yubel in your hand and special summon Yubel - Terror Incarnate.
You can search Fire King Island with Planet Pathfinder, search Yubel with Sangan, and search Fire King Avatar Yaksha with Fire King Island to deck out quicker.
You can destroy Fire King Avatar Yaksha to search another copy with Fire King Island. Although you do not need to activate Fire King Avatar Yaksha's effect upon destruction.
During your final turn, summon The Calculator. The Calculator gains attack from the level of all monsters you control. With the combined level of him, Yubel - Terror Incarnate, and Gravekeeper's Vassal he will have 4800 attack.
Use double summon so that you can summon Gravekeeper's Vassal and use Secret Pass to the Treasures and Union attack on him.