To help show demonstrate how this worked, let me show you the mock-up I made for playtest: The card came into play with the counter on the first space
This is the kind of card you want on turn one every single game, so as to allow you to cast literal Rampant Growth on turn two

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Prerelease foils might see a resurgence in the future once more collectors realize how much more scarce they actually are, but for now I can safely say that you want the set foil 100% of the time when youre given a choice between the two.