With a barrage of draw spells, you can dig through your deck for your crucial extra-turn cards more quickly
The most logical next step would be a set focusing on Generation 2, with the featured Pokmon potentially being Tyranitar, Umbreon, or even one of the Legendary Beasts like Suicune
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However, blue also gives you plenty of good reasons to tap your artifacts: And then there are the multicoloured cards, mostly blue: It seems to me that while certain groups of cards overlap perfectly, some clash in the most horrible way, precisely in the same colours where they should overlap
By focusing your build around the dice-rolling mechanic, you can ensure that you're creating Robot and Treasure tokens consistently