I personally never farm him many times yet since it just started, but I put in a single Dragon monster. First priority fusion summon dark paladin, then Dragon destroyer.
Now that I analyze OP deck list carefully, it is... trash.
1. Reduce amount of substitute
2. Only 1 union enough
3. Including searcher, there are 5 buster blader. You don't need that many my gosh
4. You don't need AMA since you never need to attack his monster. All you need is negate his vortex