While there typically isnt a round of priority during the cleanup step, sometimes things can happen that allow people to take actions during that step
Kopala doesnt address the biggest issue for creature typal decks (that would be board wipes) but it makes it a heck of a lot harder to deal with your creatures in any other way
In other words, whats the first Pokemon card? Is a different question than whats the first card with a Pokemon on it? If we are going to value a first appearance then honestly the video game is more of a correct answer First physical product to mention/depict Pocket Monsters
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Well, thats because its a Shiny version of Latias, and these special Pokmon types often have a different color scheme, which really makes them stand out
Thankfully, many of the best cards in Magic are dual-colored or more