Not only do you need to have the Dark Magician in your hand, as well as Buster Blader, but then you also need a way to fuse them too
Smile Potion X TRAP If your opponent controls a monster whose current ATK is higher than its original ATK, while you control no monsters: Draw 2 cards
Chorozo, of course, also helps out as material for the Fusion Summon of Zoroa, the Magistus Verethragna that can help you negate a monster effect by sending 1 Magistus monster to the GY, and then you can destroy 1 card on the field
This does damage your leader, but resting two blockers opens up a direct strike on their leader
Once its done, Ill send it straight to your email from [email protected] so keep an eye on your inbox (and maybe your spam folder, just in case!)