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It doesn't help that Kaheera is a Cat but not an Elemental, but I'm guessing that there will be some combination of an Elemental framework of Leafkin Druid, Risen Reef, and Omnath, Locus of the Roil along with Kaheera, Questing Beast, and a few other choice creatures

Now consider that Visions put phasing in close proximity with some of the all-time-best ETB triggers, and that the average players understanding of the rules (and to be fair, the rules themselves) were much more loose than in our present era

Players must use their creatures to battle against their opponent and knock out all of their Pokmon to win

Thankfully, were here to answer that exact question