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The key is to have 0s at the beginning of your deck. Only use them when riku uses dark aura.
Also i liked not using many magic cards(they take to long to cast. You also need to have relatively high health preferably 2 bars worth. Hope this helps.
.....I used Zanketustan when he used dark aura. By the way even at a high level Riku 4 is a pain in the ***. I used judgement a lot also. Keep plenty of high level cures. U get Riku's card which is one of the best spoils in the game.