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Combining this with the MTR's mention that drawing a card is a meaningful change, I think we can reasonably extrapolate this to any game variable changing, so a player gaining life or adding mana to their mana pool would also be a relevant change as long as the new value is likely to matter

Magnemite takes 20 additional damage from Fighting-type attacks

RNG is the same as luck

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Would a Kethis, the Hidden Hand deck play this just for self-mill

They just bought it at a faster rate than it was being listed, hence it results in no copies being available