I do like the restriction for the copy ability, but mono-blue as access to so many cantrips, I dont think it really matters
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These cards are so sought-after because of their rarity, so a collector having multiple thousands of the rarest in perfect condition from a single set (and a set which, as we'll come to, has its own controversy over the rare cards) was bound to raise some eyebrows: And sure enough, it did
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It would fit best in a control or stax-style deck that can tap opposing creatures at instant speed (e.g., with cards that tap creatures on entry or via activated abilities) or in an aristocrats-style deck that benefits from sacrificing its own creatures (death triggers, token fodder), ideally breaking the symmetry