Were could I get a water field card at?
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The card is called UMI. IRIS uses water cards, if she uses one in your battle with her, really easy, then you'll get one in the slot machine at the end.
Also you could try and get some of her other cards, Aqua dragon has a good effect and I find it good in a tricky situation, not to mention a Roaring ocean snake, nice cards.
Hope I helped.
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