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Promo cards use their own unique denotations and numbering systems separate from the sets that are released at the same time

Terra stands out from these other cards as having a slightly weaker thematic tie between one of her abilities in Magic and her mechanics in Final Fantasy 6

This would represent her speed in-game and serve as a fun nod to Lightning (bolt). It may not seem very powerful, but perhaps she can be flickered or has an ability to flicker herself

Its hard to say for sure, but we can make a deduction based on a few assumptions

Blue/Blacks two signpost uncommons provide two very different answers

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