You'll develop intuition about card ratios through dedicated practice and strategic analysis
@pokemonrevolution recently presented a new and likely theory for these Grey Thick stamps, which I will quote here: Grey Stamp Theory Grey stamped 1st Edition Base set cards for the most part have commonly been considered to exist because of either A) The ink was low when they were stamped B) The stamp was not pressed down with enough force to create a nice dark color
to be used by Monty Python fans in their competitive decks in whatever format they play
At first, I assumed it would be a reprint of the original Base, Jungle, and Fossil sets, with a few extras thrown in
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Tier : This truly means what it says and is commonly used in trading card games to group together decks into competitive levels