You will achieve a duel assessment of 7000 If you can inflict over 9999 damage with Cerberus's attack while no card is in your deck and just 100 your Life Points remain. You can increase the score by 200 by each time you use Prismatic Card.
See the deck page!
For how to use the High Score Cerberus deck, tap the button below and read through the page. The page shows many tips for getting high score with this deck.