How is my Spell caster Dragon Deck? Any Recommendations?

Personally, a combo with dragon decks i love is to take a dragon's mirror card and a five headed dragon. Five headed dragon fusion is any 5 dragons, and the dragon's mirror card allows you to take those from your graveyard or field, instead of hand or field with polymerization. The five headed dragon has 5000 attacks and is immune to almost all attacks, so it is definetely a worthwhile card.