Hildibrand Manderville would have been a really interesting card to see in the main set, at least mechanically
This ties in nicely with the Chocobo breeding features in Final Fantasy VII, which this card is based on

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Obviously, rolling a d20, as it usually happens in non-silver-border context, is much stronger than rolling d6 here
There was something about the feverous demand for the cards - the shiny ones, the powerful ones, the ones with the coolest critters on the front - that drove prepubescent children to lie, cheat, steal, start black markets, and fight