@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
Determined to prove their mettle, Mega Heracross ex, Mega Lopunny ex, and even more Pokmon line up to give it their all in the Pokmon TCG: Mega EvolutionPhantasmal Flames expansion
graveyard decks are weak to graveyard hate
Product in preorder - Prerelease June 6th
While some of the Momir cards were released to craft in Arena Anthology 4, a new swath of uncraftable cards came in with the Powered Cube
Since it's likely there are very few quality copies of the card in circulation, it's easy to see why promo cards like Illustrator - or the prize cards awarded at the first Pokmon tournaments - easily outstrip fan favorites like the first edition Charizard Pokmon card