Red Dragon Archfiend/Assault Mode + Sacred Phoenix of Nephthys. Attack with SPoN, then RDA/A. RDA/A destroys SPoN. Next turn SPoN returns and destroys all spell/trap cards on the field.
Red Dragon Archfiend/Assault Mode + Stardust Dragon/Assault Mode + Horn of the Unicorn (+ card trader). Equip HotU to RDA/A. Negate with SD/A. Return HotU to the top of the deck. Attack with RDA/A. Return SD/A to use during your opponent's turn. Can combo the above with SPoN.
RDA/A + SD/A + Skill Drain.