Using elements unite
-)Thin out deck how you would normally
-Use cards such as dimension capsule or goblin house keeping to ensure u can get magic jammer or divine wrath to prevent him from fusion summoning necroid shaman which will destroy ur gate guardian
-Remember to get trap jammer out too, setting it before ur last turn to prevent Jaden's negate attack trap card which will prevent your union attack combo on vassal
-On ur last turn use union attack combo on vasal for a direct attack
The only changes I made are swapping Goblin and Shard for Gravekeeper's Recruiter and Wonder Wand. Also replaced Trap Jammer with Anti-Magic Arrows, as suggested by the other Anon.