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These Pokemon usually had low HP but high attack or trickster abilities

The Secret Lair drops themselves are significantly increasing the supply of some of these cards (we have already seen the original printings of some Secret Lair reprints dropping in price, like Marrow-Gnawer), and even if Magic continues to grow, the supply of these reprints is high enough that, at least for most, it's unlikely they will explode in price in the near future