Fourteen
03 Elemental Hero Prisma
03 Vortex Trooper
03 Dark Magician
02 Dark Magician Knight
02 Dark Eradicator Warlock
01 Dark Magician of Chaos

Twenty-One
03 Magical Mallet
03 Knight's Title
03 Dark Magic Attack
03 Swing of Memories
02 Dedication of Light and Darkness
02 Reinforcement of the Army
01 Premature Burial
01 Heavy Storm
01 Card Destruction
01 Swords of Revealing Light
01 Monster Reborn

Five
03 Threatening Roar
02 Reckless Greed

fusion deck is? fusion decks are necessary when dealing with Prisma.

Fusion deck is Dark Paladin and Dark Flare Knight.

what's dark flare knight do and what are its fusions?

It's effect is mediocre and not needed. Important part is that Dark Magician is a fusion material for both Dark Paladin and Dark Flare Knight. They both are to make Prisma's effect work.

if you say so.... curtain of dark magic? or maybe it's dark magic curtain.... dunno.

oh and why do you need the Flare Knights then? seems like the Paladins would be enough.

It's Dark Magic Curtain yeah. It isn't used because this deck is solely around milling Dark Magician to the graveyard with Elemental Hero Prisma and using cards that work with Prisma's new name like Dark Magic Attack, Knight's Title etc. which is a better combination as a cost of half your life points isn't needed, and you get a free target for Swing of Memories, Premature etc.; giving more OTK potential.

Of course, the fusion deck isn't important, as long as you have targets with Prisma. Of course, Paladins are enough but it's nice to put Dark Flare Knights because they work too.