The main goal is not to allow Arkana to summon his DM. As soon as possible, fusion summon D.Paladin to negate any spell. Destroy every monster Arkana summons. After that, when you have the fusion materials, fusion summon either Meteor B. Dragon or B. Skull Dragon and keep destroying Arkana's monsters and negating his spells with D.Paladin. In the final turn, do the combo (Piranh,GOTM,Riryoku)!
It's "The Earth-Hex-Sealed Fusion".
You can get it on card trader. But it just a material of fusion. You can put another card that work like that instead if you can't afford it.